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Equipment Discussions >> Cats & Casses

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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Orion 180mm Maksutov-Cassegrain Questions
      #5739844 - 03/17/13 11:36 PM

I'm considering this scope. If you have one, could you comment on it for me? I'm interested in it for planets, Moon and tight DSOs.
I see it has a 1-1/4" back but there's a converter available for 2" accessories. I normally would get a 2" visual back with a focuser, since I don't like that coarse focusing little knob on the back. But question is, is a 2" back going to give me anything since a f/15 light cone has got to be pretty tight by then..... except that I have a lot of nice 2" EPs, but not many low power 1-1/4" EPs. I would put this on my Atlas EQ-G, and I also like to be able to rotate the focuser too. I don't know if there's a rotatable 1-1/4" focuser.
Do you use a straight through or 90* finder?
Can you mount a dovetail on it in order to attach an auxiliary scope or maybe guide scope?
Are the visuals really APO refractor like? Any other links or references would be great. THANKS
Bob


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herrointment
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Reged: 03/12/11

Loc: North of Hwy. 64
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5739870 - 03/17/13 11:56 PM

LINK

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jfoley68
member


Reged: 03/30/12

Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: herrointment]
      #5739915 - 03/18/13 12:34 AM

I'm very curious about these too, and am trying to decide between one of these or a C8 EDGE. Not sure what I'd prefer right now.

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iluxo
sage


Reged: 09/23/08

I have the SkyWatcher 180mm f/15 new [Re: jfoley68]
      #5739959 - 03/18/13 01:28 AM

... it has a 2" back as standard, and its able to fill a 40mm diameter field at the eyepiece. The back is similar to a Celestron or Meade SCT back, but the screw thread is a different diameter (they aren't interchangeable) so you might have issues finding a stock focusser that can screw onto this, if you are really determined to do that.

Personally I don't have any issues with the internal micrometer focusser, it's fine enough. There is a little lateral shift in the mirror but its only noticeable at high power.

Anyway at f/15 these scopes are visual, not really for photography.

It comes with a 9x50mm straight through finder, though you replace that with a right-agle one (Skywatcher do make one that fits).

FWIW the secondary obstruction is distinctly smaller than in the f/10 SCT's and it really does count, this scope will show textbook diffraction rings in good seeing. But you do have to wait a while for it to cool down.

There is one other aspect - these scopes don't dew over as easily as SCT's and I have never needed to add a dew cap or heater on my scope, in 6 years.

Edited by iluxo (03/18/13 01:31 AM)


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moynihan
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Reged: 07/22/03

Loc: Lake Michigan Watershed
Re: I have the SkyWatcher 180mm f/15 new [Re: iluxo]
      #5740245 - 03/18/13 08:45 AM

Quote:

... it has a 2" back as standard, and its able to fill a 40mm diameter field at the eyepiece. The back is similar to a Celestron or Meade SCT back, but the screw thread is a different diameter ...Anyway at f/15 these scopes are visual, not really for photography.... these scopes don't dew over as easily as SCT's and I have never needed to add a dew cap or heater on my scope, in 6 years.




Both Orion, Synta (the owner of Celestron), Scopestuff sell little adapter rings to allow use of SCT visual backs, diagonals, third party focusers, etc. They run about $20-23 USD.

They are not recommended for DS imaging, but excel at solar system object imaging (with the exception of wide-field comet imaging of course).

Re the dew shield, your experience is probably the exception. I would strongly recommend a dew shield.


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Classic8
professor emeritus


Reged: 04/12/06

Loc: Naperville, IL, USA
Re: I have the SkyWatcher 180mm f/15 new [Re: moynihan]
      #5741142 - 03/18/13 04:56 PM

I haven't used mine much yet, I did like the view of Saturn I got when I did use it. I think it was better than in my SCT. But the jury is still out. I replaced the finder with a RA finder, much more comfortable to look through.

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vct123
sage
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Reged: 11/17/09

Loc: Staten Island, N.Y.
Re: I have the SkyWatcher 180mm f/15 new [Re: Classic8]
      #5741214 - 03/18/13 05:27 PM

Hey SpongeBob I live near you in Staten Island and while I have not owned the 180 Orion Mak Cass I have had 6 and 7" Maks from Intes and the 180 Orion Mak Newt. The problem in our area is the cool down of these scopes in the cold months here. Mine all had nice sharp views but this time of year be ready for 2- 3 hours cool down times. If you are ok with that I have heard they are nice scopes.

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hottr6
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Reged: 06/28/09

Loc: 7,500', Magdalena Mtns, NM
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5741299 - 03/18/13 06:04 PM

If you do go with a 2" Crayford (I certainly needed one on my 152mm MCT because of 'orrible image shift), you will need to shop for the shortest SCT focuser you can find, or face the dreaded 'increasing focal-length' problem.

Among the more widely known SCT 2" Crayfords, I have found that CrawMach makes the shortest-profile focuser, followed by JMI which adds a few mm of length. GSO focusers add more than 2 cms over and above the CrawMach! There may be other low-profile SCT Crayfords, but I've not found them after an extensive search.

Borg and Baader make helical focusers that are even shorter, but apparently do not work as well as the Crayfords when heavily loaded with gear.

Shane in gray-zone NM


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skyjim
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Reged: 01/13/07

Loc: Carmel, NY
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5747534 - 03/21/13 12:39 PM

A 7" MCT is a very good scope providing you live in the southern states. The Orion/Synta variants have no cooling vent's at all which mean's you have to take the scope apart and drill holes in it for some type of cooling system here in NY cause the late fall,winter and early spring will end up with a 3 hour window for cool down time. The Intes Micro scope's that are newer model's have had at least some type of passive cooling which help's but maybe were looking at taking and hour off the 3 hour window, belive me I have owned maybe 10 different MAC's from Intes/Intes Micro,AT/Bosma,6" Orion just to name a few plus a little Meade 90 and all had cool down issue's. I finally threw in the towel and bought a C8HD which is every bit as well corrected in the FOV as the mac's plus it has passive cooling so what I am telling you is that living here in the NE the mac's are a love/hate type scope but like most we all live and learn.
Jim

PS the nicest 6" mac's I owned were the IM 6511/603 variants and the AT6M/Bosma mac's, the AT6M was the cheapest and best bang for the buck but Astronomics stopped there inportation, both were Rumak design and held up very well in summertime lunar/planetary veiws but forgetaboutit in any other season's.


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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: skyjim]
      #5747585 - 03/21/13 12:59 PM

Quote:

A 7" MCT is a very good scope providing you live in the southern states. The Orion/Synta variants have no cooling vent's at all which mean's you have to take the scope apart and drill holes in it for some type of cooling system here in NY cause the late fall,winter and early spring will end up with a 3 hour window for cool down time. The Intes Micro scope's that are newer model's have had at least some type of passive cooling which help's but maybe were looking at taking and hour off the 3 hour window, belive me I have owned maybe 10 different MAC's from Intes/Intes Micro,AT/Bosma,6" Orion just to name a few plus a little Meade 90 and all had cool down issue's. I finally threw in the towel and bought a C8HD which is every bit as well corrected in the FOV as the mac's plus it has passive cooling so what I am telling you is that living here in the NE the mac's are a love/hate type scope but like most we all live and learn.
Jim

PS the nicest 6" mac's I owned were the IM 6511/603 variants and the AT6M/Bosma mac's, the AT6M was the cheapest and best bang for the buck but Astronomics stopped there inportation, both were Rumak design and held up very well in summertime lunar/planetary veiws but forgetaboutit in any other season's.




Well, I'm in NJ, but I plan on storing it in a detached unheated garage, so cool down is not a problem. I'm also around all the time, so I can plan easily for cool down way before sunset.
Thanks for the info on your Maks. Did you use an optical focuser on the back or did you do all your focusing with the mirror? I see the Orion has now 'fine' focusing. The iOptron 150mm version does, along with a 2" back, but you can't really find any pictures or information on line about that. That worries me from a point of resellers knowledge and return / quality issues. I can't even tell if the Orion one has a objective cover b/c of the lack of pictures.
But thanks and any other information you have, pls pass it on!
Bob


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hfjacinto
I think he's got it!
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Reged: 01/12/09

Loc: Land of clouds and LP
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5747622 - 03/21/13 01:16 PM

Bob,

Tony from AAI has an Intes Mak, you should look through it, its really nice, but cool down is an issue. I can ask him to bring it next time he comes up to JJ.


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SteveSMS
super member


Reged: 03/29/08

Loc: Jersey Shore USA
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5747634 - 03/21/13 01:19 PM

Hi Bob,

I'm in Jersey too and I too keep my scopes in an unheated space. I had a TEC6 MCT that had a small internal fan and it still took 2 hours or more to equalize in cold weather. I have also had the Orion 127mm Mak and it too took way too long to cool down for me. I now have an EdgeHD 8 and it not only has more than acceptable optics it is Jupiter ready in 45 minutes to an hour. Maks are nice scopes but they have some real caveats.

Clear Skies,

Steve


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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: hfjacinto]
      #5747662 - 03/21/13 01:40 PM

Quote:

Bob,

Tony from AAI has an Intes Mak, you should look through it, its really nice, but cool down is an issue. I can ask him to bring it next time he comes up to JJ.




That would be great!! A picture and owners experience is worth a 1000 thread readings!

bob


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skyjim
Carpal Tunnel
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Reged: 01/13/07

Loc: Carmel, NY
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5748120 - 03/21/13 05:36 PM

Funny, I did the same and still do store my scope's in an unheated garage, it help's as far as taking anywere from .5 to 1 hour off cool down time's then you have to deal with on some night's temp swing's. To get the best image its best in summertime. After 10 yer's plus of trying different mct's I was done. The Intes Micro scope which was my last one I owned I placed a real nice Event style focuser, it didn't add more than a pound on the back of the ota plus it didnt add that much to the total FL of the system. The C8HD's focuser has been the best I have seen plus zero image shift which was a pleasure to use right outa the box, just undo the mirror lock and I was good to go. The Ioptron 6" mac is the same optics as the AT6M but has the two speed focuser which I found not the much better than the AT6M. The optics on the AT6M was better IMO. Resale value on MCT's suck, sorry I am not going to surgar coat what I have seen and been threw so like I said its a love/hate kinda thing with MCT's.
Jim


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rg55
scholastic sledgehammer
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Reged: 08/02/08

Loc: western US
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5749672 - 03/22/13 01:13 PM Attachment (141 downloads)

Quote:

I'm considering this scope. If you have one, could you comment on it for me? I'm interested in it for planets, Moon and tight DSOs.
I see it has a 1-1/4" back but there's a converter available for 2" accessories. I normally would get a 2" visual back with a focuser, since I don't like that coarse focusing little knob on the back. But question is, is a 2" back going to give me anything since a f/15 light cone has got to be pretty tight by then..... except that I have a lot of nice 2" EPs, but not many low power 1-1/4" EPs. I would put this on my Atlas EQ-G, and I also like to be able to rotate the focuser too. I don't know if there's a rotatable 1-1/4" focuser.
Do you use a straight through or 90* finder?
Can you mount a dovetail on it in order to attach an auxiliary scope or maybe guide scope?
Are the visuals really APO refractor like? Any other links or references would be great. THANKS
Bob




Hi Bob,

I do own this telescope. For imaging it is mounted on a CG5.

1. 2" back: I have not tried this so no personal experience.
2. Finder: I use a 90 degree finder
3. Auxiliary dovetail: You should be able to do this. I purchased my scope second hand and it came with a rail mounted on it.
4. Visuals: I find the visuals to be almost refractor-like. I'm quite satisfied with them, given the aperture. This is probably the largest Maksutov I can have outside of an observatory.

Below are some images taken through a 180mm Orion Maksutov using a NexImage 5 camera. I have not done any DSO imaging. I have only owned it for two months, so my examples are limited.

First up is the Apennines, including the Apollo 15 landing site/EVA area.


Edited by rg55 (03/22/13 01:43 PM)


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rg55
scholastic sledgehammer
*****

Reged: 08/02/08

Loc: western US
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: rg55]
      #5749674 - 03/22/13 01:14 PM Attachment (217 downloads)

Jupiter.

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rg55
scholastic sledgehammer
*****

Reged: 08/02/08

Loc: western US
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: rg55]
      #5749684 - 03/22/13 01:17 PM Attachment (167 downloads)

Archimedes and Plato.

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rob cos.
scholastic sledgehammer
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Reged: 03/11/04

Loc: New England
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: rg55]
      #5750466 - 03/22/13 07:45 PM

Love the photos! I'll be dabbling with imaging through the Neximage this Spring!

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mdowns
Pooh-Bah
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Reged: 06/12/10

Loc: Englewood,FL
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: rob cos.]
      #5750559 - 03/22/13 08:36 PM

Bob,
I had this scope while here in Florida and it was a fabulous performer. Often handled crazy high mags without breakdown and was killer on the planets and moon. Very very tight stars.However another cnighter,Mike K.in central IN,bought one and as much as he wanted it to work for him,I dont think it ever did.The seeing was never really steady enough for him to realize the full potential of the scope.I believe the same will be true for you in your location.The 7" maks are tempermental,best suited for steady enviroments and a bit warmer temps.I'd lean towards that 8" edge,as much as I liked the 7,I think you'll do better in NJ with the edge.Good luck!


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spongebob@55
scholastic sledgehammer
*****

Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: mdowns]
      #5750821 - 03/22/13 10:28 PM

skyjim and mdowns.....I really appreciate both your honesty. Its refreshing. I guess since I travel a lot an hour and a half to darker sites, this really is not the way to go for me. I appreciate everyone's input, and I'm just going to have to look at some other type of scope to compliment my C14 f/11
Regards,
Bob


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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5753410 - 03/24/13 08:54 AM

I love my Orion 180mm Mak-Cass! Great for planets and Moon!

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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5753738 - 03/24/13 11:30 AM

Quote:

I love my Orion 180mm Mak-Cass! Great for planets and Moon!




So most people love them but have issues with up to 3 hour cooling. You're in Chicago area. How do you cool it down and how do you handle going out at 30 degrees and it drops to 15 degrees in an hour or two? Does the scope adjust for very good seeing? Your input is appreciated.


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GOLGO13
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Reged: 11/05/05

Loc: St. Louis area
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5753808 - 03/24/13 12:07 PM

Helps being the "windy" city

Cool down would be my main concern. There are other companies with these size ones that have some sort of cooling help. But they are a bit hard to find nowadays. I see them used from time to time. They sell pretty quick.


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Eric63
professor emeritus


Reged: 06/16/12

Loc: Ottawa, Ontario
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: GOLGO13]
      #5753831 - 03/24/13 12:18 PM

I keep toying with the idea of upgrading my 127Mak but I fear that cooling will be an issue in my climate. Anyway, the seeing here never lets me go much past 120mm aperture for planetary viewing

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payner
scholastic sledgehammer
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Reged: 03/22/07

Loc: Bluegrass Region, Kentucky
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Eric63]
      #5753965 - 03/24/13 01:15 PM

I have a 228 mm Rumak and it is an incredible instrument. The images of solar system objects and double stars are very pleasing with good contrast. Globular and open clusters, many faint fuzzies and planetary nebulae are great in the Rumak, too.

Best,
Randy


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Illinois
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Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5755604 - 03/25/13 07:32 AM

Quote:

Quote:

I love my Orion 180mm Mak-Cass! Great for planets and Moon!




So most people love them but have issues with up to 3 hour cooling. You're in Chicago area. How do you cool it down and how do you handle going out at 30 degrees and it drops to 15 degrees in an hour or two? Does the scope adjust for very good seeing? Your input is appreciated.




Thats easy! If I know tonight will or suppose to be clear then I put my 180mm Mak-Cass outside in shade 3 to 4 hours before sunset. One thing I wouldnt do at 3 in morning unless If I want left my scope outside all night. I use my 4 inch refractor most of the time. 3-4 hours for my 180mm Mak-Cass, 2 hours for my 16 inch dobsonian and 1 hour for my 4 inch refractor. I live about 100 miles from Chicago now.

Drop 30 down to 15 degrees I wouldnt put my scope outside that long. My Garage is cold!


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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: payner]
      #5755989 - 03/25/13 11:40 AM

Quote:

I have a 228 mm Rumak and it is an incredible instrument. The images of solar system objects and double stars are very pleasing with good contrast. Globular and open clusters, many faint fuzzies and planetary nebulae are great in the Rumak, too.

Best,
Randy




Very, very nice. Where a site or from whom did you buy that so I can check it out online?
Bob


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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5756017 - 03/25/13 11:54 AM

Quote:

Quote:

Quote:

I love my Orion 180mm Mak-Cass! Great for planets and Moon!




So most people love them but have issues with up to 3 hour cooling. You're in Chicago area. How do you cool it down and how do you handle going out at 30 degrees and it drops to 15 degrees in an hour or two? Does the scope adjust for very good seeing? Your input is appreciated.




Thats easy! If I know tonight will or suppose to be clear then I put my 180mm Mak-Cass outside in shade 3 to 4 hours before sunset. One thing I wouldnt do at 3 in morning unless If I want left my scope outside all night. I use my 4 inch refractor most of the time. 3-4 hours for my 180mm Mak-Cass, 2 hours for my 16 inch dobsonian and 1 hour for my 4 inch refractor. I live about 100 miles from Chicago now.

Drop 30 down to 15 degrees I wouldnt put my scope outside that long. My Garage is cold!




Yes, I would keep mine in an unheated detached garage. And I also do the same, keeping an eye out for a clear night. I put my C14 out, and cover it with a white sheet hours before night. Its coming from said garage, so its not bad. And I'm home all the time, so I can do it. I guess that's what the others issue is, they can't get it outside during the late day time for its longer cool down time. I can plan, and that's my benefit I guess.
GUYS WITH COOL DOWN ISSUES- is that the problem, not being able to plan a cool down period before darkness? Or do you feel its just a pain to wait?
Thanks
Bob


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iluxo
sage


Reged: 09/23/08

Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5757181 - 03/25/13 10:50 PM

Mine is stored in its case in an unheated garage - after setting up for observing the cool-down time is under 1 hour.

I also discovered a little trick - if you quickly rotate the tube several times (like shaking a can of soup) and force the air inside to mix, you can disrupt the internal tube current enough that seeing will be ok for a while.


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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5757618 - 03/26/13 07:38 AM

Quote:

Quote:

Quote:

Quote:

I love my Orion 180mm Mak-Cass! Great for planets and Moon!




So most people love them but have issues with up to 3 hour cooling. You're in Chicago area. How do you cool it down and how do you handle going out at 30 degrees and it drops to 15 degrees in an hour or two? Does the scope adjust for very good seeing? Your input is appreciated.




Thats easy! If I know tonight will or suppose to be clear then I put my 180mm Mak-Cass outside in shade 3 to 4 hours before sunset. One thing I wouldnt do at 3 in morning unless If I want left my scope outside all night. I use my 4 inch refractor most of the time. 3-4 hours for my 180mm Mak-Cass, 2 hours for my 16 inch dobsonian and 1 hour for my 4 inch refractor. I live about 100 miles from Chicago now.

Drop 30 down to 15 degrees I wouldnt put my scope outside that long. My Garage is cold!




Yes, I would keep mine in an unheated detached garage. And I also do the same, keeping an eye out for a clear night. I put my C14 out, and cover it with a white sheet hours before night. Its coming from said garage, so its not bad. And I'm home all the time, so I can do it. I guess that's what the others issue is, they can't get it outside during the late day time for its longer cool down time. I can plan, and that's my benefit I guess.
GUYS WITH COOL DOWN ISSUES- is that the problem, not being able to plan a cool down period before darkness? Or do you feel its just a pain to wait?
Thanks
Bob






Always make plan and ahead of time! Simple!


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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: iluxo]
      #5757622 - 03/26/13 07:39 AM

Quote:

Mine is stored in its case in an unheated garage - after setting up for observing the cool-down time is under 1 hour.

I also discovered a little trick - if you quickly rotate the tube several times (like shaking a can of soup) and force the air inside to mix, you can disrupt the internal tube current enough that seeing will be ok for a while.






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spongebob@55
scholastic sledgehammer
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Reged: 12/26/11

Loc: Bergen Co. New Jersey
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5763076 - 03/28/13 07:58 PM

So which 1-1/4" E.P.s work best? I have mostly 2" EPs, and my longest one is a Sterling Plossl 25mm. Are there longer EPs in 1-1/4"?
thanks
Bob


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garneroutlaw
member


Reged: 03/28/13

Loc: Northeast Florida
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5763455 - 03/29/13 12:18 AM

I am fairly new to the hobby, and I purchased the 180mm Mak. Something about it being a 'planet killer' was definitely appealing. I quickly realized that cool down with this scope is appalling. Expect two hours of cooling minimum with this scope on cooler nights. Even after two hours last night, stars were 'bleeding' and Jupiter had a fuzziness to it. I star tested it to confirm my suspicions. Collimation looks good but got the typical distorted pattern from an uncooled scope. It really is a big issue with this OTA, and I recommend finding something with a bit more reasonable process to cool unless there is a way to cool this scope faster that I am unaware of. I am still debating returning this scope due to that factor. It just simply isn't any fun sitting outside for 2 hours waiting to use it. If I do keep it, does anyone know where I can purchase a screw on cover for Orion Mak-Cass adapter ring?

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watcher
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: garneroutlaw]
      #5765705 - 03/29/13 08:41 PM

If I were to have one of the Synta 180s, I would seriously look into modifying it with a cooling fan. I have an IM715 with a fan, and cooldown is not nearly as severe. I usually don't observe in very cold temps, but early Spring and late Autumn are not much of a problem with an hour - 2 hour at the most. It's actually quite usable in as little as 45 minute if the temps aren't too extreme. Anyway, a fan, a drill, and a little courage could make a big difference in wait time.

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eyepiecedropper
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: watcher]
      #5766460 - 03/30/13 10:35 AM Attachment (90 downloads)

hi, hereīs my cat cooler. 15 euros. no beauty, but it works. strong radial cooler. 20mm diam. plastic tubing and tube endcaps from my local diy market. 4 angled holes in the endcap. no filter.

greets, martin


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5766850 - 03/30/13 01:09 PM

Quote:

Quote:

I have a 228 mm Rumak and it is an incredible instrument. The images of solar system objects and double stars are very pleasing with good contrast. Globular and open clusters, many faint fuzzies and planetary nebulae are great in the Rumak, too.

Best,
Randy




Very, very nice. Where a site or from whom did you buy that so I can check it out online?
Bob




Hi Bob: You can see the specs on this telescope here: http://stellaroptical.com/santel-mk9.htm.

This instrument is no longer produced, these were handmade and the optician was with Intes (INTES MK91)before they were dissolved after the cold war. The mirror is Sital, and even though the tube is closed, the effects of thermal cooling is not a big deal in all but extreme conditions (January/February) because of the properties of the Sital mirror.

Unfortunately, the optician/owner of Santel (Anatoly Sankovitch) now makes professional-size instruments only. See the webapage http://astreya-optics.narod.ru/eng/links.htm.

This doesn't help you but for the history and specs. If you ever see one for sell and really want a RUMAK of this size, they don't get much (if any) better.

Best,
Randy


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: payner]
      #5767076 - 03/30/13 03:45 PM

Randy, I got a 404 error when I tried the link.

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payner
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Calypte]
      #5767564 - 03/30/13 08:34 PM

Try http://stellaroptical.com/cass.htm and for the Russian site:
http://astreya-optics.narod.ru/eng/links.htm

Anatoly Sankovitch is the gentleman's name that produced the Santel telescopes and Andrey at Astreya Optics can (or could) get one in touch with him. I understand Anatoly has a hard time with English.

Best,
Randy


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: eyepiecedropper]
      #5814241 - 04/21/13 10:07 PM

Quote:

hi, hereīs my cat cooler. 15 euros. no beauty, but it works. strong radial cooler. 20mm diam. plastic tubing and tube endcaps from my local diy market. 4 angled holes in the endcap. no filter.

greets, martin




Thanks Martin, I can't really understand what you did here, could you go over it again? did you drill holes in the OTA? What's the 20mm tube for? Sorry to have you go over it again, but its interesting for a few of us, or at least me.
Regards,
Bob


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5819566 - 04/24/13 11:28 AM

Hello again.
I'd like to mount an Orion ST-80 to this scope. There's no way to mount a vixen dovetail to the OTA according to Orion. Any ideas? Could that shoe actually handle a set up of a single stalk big ring system with a ST80 in it? I also see Stellarvue has a f/3.75 finder.....but I'd like at least the f/5. Your thoughts?

Edited by spongebob@55 (04/24/13 12:36 PM)


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eyepiecedropper
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5819895 - 04/24/13 02:14 PM

hi bob, itīs just a crude variation of a commercial cat cooler.

http://www.lymax.com/sct/photos.php
http://www.lymax.com/sct/how.php

the air duct on mine is not centered but the concept is exactly the same.


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dweller25
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: eyepiecedropper]
      #5819977 - 04/24/13 02:53 PM Attachment (81 downloads)

Here's how I cool my 7" Mak......

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rob cos.
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: dweller25]
      #5819987 - 04/24/13 03:01 PM

Quote:

Here's how I cool my 7" Mak......




David, did you drill a hole in the diagonal and just attached the fan to it? Is there some kind of filter at the eyepiece end of the diagonal?

Thanks for sharing!

Rob


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dweller25
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: rob cos.]
      #5820020 - 04/24/13 03:21 PM

Quote:

Quote:

Here's how I cool my 7" Mak......




David, did you drill a hole in the diagonal and just attached the fan to it? Is there some kind of filter at the eyepiece end of the diagonal?

Thanks for sharing!

Rob




Hi Rob,

Yes I just drilled a hole in the side of the diagonal - a cheap 2" Skywatcher - which is surprisingly good !!

I have removed ALL filter fabric - the Mak mirror is much easier to clean than my 8" Newt


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: eyepiecedropper]
      #5820736 - 04/24/13 08:09 PM

Quote:

hi bob, itīs just a crude variation of a commercial cat cooler.

http://www.lymax.com/sct/photos.php
http://www.lymax.com/sct/how.php

the air duct on mine is not centered but the concept is exactly the same.




Look at that! Now I understand. I didn't even know these existed. I'm going to have to see what I can do here....I have a 14" SCT now, and if I can have two tubes, we're in business! Thanks so much for your posting.
Regards,
bob


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5822008 - 04/25/13 12:49 PM

does anyone know what the prime focus for the Orion 180mm is? I mean how far beyond the rear of the rear cell it focuses? I'm trying to figure out if I order the adapter to schmidt-cass ring, and add a 2 speed focuser, if it'll have enough in-focus with a 1.5" focuser body and 90* diagonal......
Thanks
Bob


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5822288 - 04/25/13 02:15 PM

Bob, that seems to depend on the mirror lens spacing. You can come to focus quite a bit outside the visual back by changing that spacing using the focus knob. If you mean "prime focus" as being the proper mirror lens spacing, really I am not sure. Maybe somewhere near the top of the diagonal, as a guess. I am not sure how to set the proper spacing to check the focus.


Edited by Asbytec (04/25/13 02:20 PM)


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Asbytec]
      #5823875 - 04/26/13 09:27 AM

What is the origin of those two little fans shown in this thread? I could use one for my Intes 6" f/12 Mak.

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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5824246 - 04/26/13 12:00 PM

Quote:

does anyone know what the prime focus for the Orion 180mm is? I mean how far beyond the rear of the rear cell it focuses? I'm trying to figure out if I order the adapter to schmidt-cass ring, and add a 2 speed focuser, if it'll have enough in-focus with a 1.5" focuser body and 90* diagonal......
Thanks
Bob




Here's the 'answer' I got, I must admit, quite fast, yesterday about prime focus and a 2" visual back/focuser....

Dear Bob

Thank you for contacting Orion.

Unfortunately I don't have the spec for the point of focus for the 180mm MC
but it is quite far back.

One caution, the port in front of the visual back is relatively small (less than 1.25") so I'm not sure how you would benefit from going to 2" accessories.
Clear skies and good observing,
XXXXXX

OK, then why does Orion sell an adapter to 2" SCT like accessories for it? Ug.

How do you define 'quite far back'?

If its true that the 'port' is less than 1.25", going to 2" would be worthless, except that you can use your 2" stuff. But then you'd have to be sure you could come to focus.

Does anyone make a 1.25 SCT dual speed focuser?

Can an owner of a 180mm Mak, either Orion or Skywatcher confirm the diameter of the visual back 'hole'? Thanks
Bob


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astro_baby
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5824545 - 04/26/13 02:27 PM

The hole is quite narrow. I use a moonlite dualmspeed on the back of mine with a 2" diagonal. You can get away with 2" fit EPs so long as the field lens is no bigger than the hole in the back.

I will be able to measure mine tomoz if no one else has answered by then. I have yet to have a 2" EP fail tomcome to focus. Theres a lot of focuser distance in the Mak 180, well mine has at any rate.

Widefield EPs ? Some are tolerable in the Mak some less so. The ES14mm 100' works ok ish. The 30mm 82' less so.

Mostly I use a 2" diagonal and 1.25 orthos in the scope.

Hope tha answers some questions at least.


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: astro_baby]
      #5825090 - 04/26/13 07:00 PM

Quote:

The hole is quite narrow. I use a moonlite dualmspeed on the back of mine with a 2" diagonal. You can get away with 2" fit EPs so long as the field lens is no bigger than the hole in the back.

I will be able to measure mine tomoz if no one else has answered by then. I have yet to have a 2" EP fail tomcome to focus. Theres a lot of focuser distance in the Mak 180, well mine has at any rate.

Widefield EPs ? Some are tolerable in the Mak some less so. The ES14mm 100' works ok ish. The 30mm 82' less so.

Mostly I use a 2" diagonal and 1.25 orthos in the scope.

Hope tha answers some questions at least.





Thanks Astro Baby. Always nice to get information directly from owners, especially of these Maks.
Not being that well informed about EPs and their functioning, you mention 'field lens'. Thats the exterior/last glass that you look into, right? (sorry
Also, did you have to get an adapter for the threads in order to use the Moonlite? Like the one Orion sells possibly?
I have a lot of wide field EPs, like the ES's. Why is it that the wide field, 30mm+ have trouble? (once again, not that EP smart)
Thanks
Bob


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5826198 - 04/27/13 12:23 PM

Quote:

OK, then why does Orion sell an adapter to 2" SCT like accessories for it? Ug.




For the simple reason that the SCT thread is something of a "universal" thread.

Lots of accessories attach using SCT threads.

Examples are focuser (you can use a 2" focuser with a 2" to 1.25" adapter) T-adapters for imaging, and accessories like the Baader 15mm SCT to T thread adapter for attaching binoviewers.

Of course the limit of the SCT back is the fact that it offers a small rear opening, so larger SCTs have a 3.25" back, but these are normally provided with a stop down adatper to, guess what, the standard SCT thread. Most owners remove the 3.25" plate and go to a AP , Eye Opener, Clicklock, or some other port that opens to 2".

Anyway, hope this answers your quesiton. The reason they sell SCT tread adapters is because there is a use aftermarket of accessories that are either 2" (like eyepeise) or specilized (imaging, binoviewing, etc).


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astro_baby
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Eddgie]
      #5826287 - 04/27/13 01:09 PM

Spongebob.....

The exit hole on the back of a Skymax 180 is 25mm in diameter (I have an older version of tyhe scope but I would think its safe to assume the newer ones are no different in this respect although the external fitting is different I believe) the exit port with the threads on acts as a field stop as far as I can tell as the light baffle is slightly wider inside the scope.

The field lens is the bit of the eyepiece nearest the telescope and furthest from your eyeball. ie the one at the bottom of the EP.

I find some EPs with wider field lenses work ok so long as your happy with the vignetting prodiced by the telescopes small rear aperture of 25mm. The widest bit of glass I have used iss an ES 30mm 82' and its horrible - the scope induces the EP into the 'ring of fire' syndrome where the edge of the EP glows with a bright ring. Its very distracting and generally very undesirable. On the other hand the ES 14mm 100' works ok(ish). it vignettes but the view on the centre of the FOV is perfectly fine. Lets face it if you want mega wide views of things then a Mak isnst really the ideal instrument to be using. Thats not a genative againts the Mak - all telescopes have their downsides (Newts are fussy with collimation and create coma, Achromatics produce CA and APOs are hellish expensive so nothings ever perfect - its always a compromise to some degree).

If you want a full on hit/review of my own experiences with a Skymax I wrote it all up here http://www.astro-baby.com/reviews/Skymax%20180/Skymax%20180%20Review.htm

The article covers my own personal journey with the scope and you may find it of interest.


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: astro_baby]
      #5826714 - 04/27/13 04:45 PM

Quote:

Spongebob.....

The exit hole on the back of a Skymax 180 is 25mm in diameter (I have an older version of tyhe scope but I would think its safe to assume the newer ones are no different in this respect although the external fitting is different I believe) the exit port with the threads on acts as a field stop as far as I can tell as the light baffle is slightly wider inside the scope.

The field lens is the bit of the eyepiece nearest the telescope and furthest from your eyeball. ie the one at the bottom of the EP.

I find some EPs with wider field lenses work ok so long as your happy with the vignetting prodiced by the telescopes small rear aperture of 25mm. The widest bit of glass I have used iss an ES 30mm 82' and its horrible - the scope induces the EP into the 'ring of fire' syndrome where the edge of the EP glows with a bright ring. Its very distracting and generally very undesirable. On the other hand the ES 14mm 100' works ok(ish). it vignettes but the view on the centre of the FOV is perfectly fine. Lets face it if you want mega wide views of things then a Mak isnst really the ideal instrument to be using. Thats not a genative againts the Mak - all telescopes have their downsides (Newts are fussy with collimation and create coma, Achromatics produce CA and APOs are hellish expensive so nothings ever perfect - its always a compromise to some degree).

If you want a full on hit/review of my own experiences with a Skymax I wrote it all up here http://www.astro-baby.com/reviews/Skymax%20180/Skymax%20180%20Review.htm

The article covers my own personal journey with the scope and you may find it of interest.




Hi Astro Baby and Eddgie,
Thanks so much for your 1st hand information.
I'm a bit surprised how small the hole is. I guess with a f/15 scope, that light cone is really long and tapers down quite slowly.

As to the wide fov EPs, that absolutely makes sense that wide EPs / wide fov's are not what we're going for with this scope. Luckily I have a couple ortho's and plossls. This will be for me, my lunar and planetary and tight DSO backyard scope.
Field lens. duh,.... sure, that's the lens next to the field stop I should've known that!
Thanks for the link. I read it with great interest, especially the Moonlite focuser part. So a focuser at this point in this kind of scope really doesn't give you anything more than a 2 speed focuser and the ability to use 2" accessories. And it not too long to create any problems with in focus when used with a 2" diagonal. I'm kind of torn right now. Perhaps I'll wait until mine is delivered to make that decision. I have a Baader clicklock 2" diagonal which I love and I love being able to rotate the focuser. I do as much observing sitting down....another benefit of a Mak-Cass during 3-4 hour observing sessions...less fatique.

Do I assume correctly that you bought the Mak thread to Cass thread adapter so that the SCT Moonlite would work?

Well, thanks again for the information!

Regards
Bob

Edited by spongebob@55 (04/27/13 05:07 PM)


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5826767 - 04/27/13 05:16 PM

Well, I ordered an Orion f/15 Mak. Won't be delivered until mid June, but that's OK. I don't want to close this thread down yet; I'm sure I'll have more questions, and I think that the Mak-Cass platform has a lot to offer to an informed observing audience. Well, I'll see, won't I?
Keep your 'cards and letters' coming. And you readers, if you have a question, join the conversation. You see how informative these guys are! Thanks.


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astro_baby
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5826978 - 04/27/13 06:53 PM

Spongebob,

I wouldnt buy a two speed focuser until you have used the scope and mace up your own mind about whether you find the image shift caused by a Maks focusing to be acceptable or not. For me it was bearable but I wanted better, others find its fine as it is. In many of these things its a matter of taste.

I did get the an afapter to connect the Moonlite to the scope. The ealy scopes though, and mine is from among the first ever available had different threads go later models so it would be wise to wait and see and/or consult a dealer. I believe, but dont know for sure, that the later scopes have a standard SCT thread whereas the early ones had a sifferent sized thread. Slightly smaller than an SCT thread on the orginals.
Lucky for me I hac an adapter thrown in with the scope.

Perhaps somone else can afvise on ghis on later models.


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Wil2010
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: astro_baby]
      #5829845 - 04/29/13 10:22 AM

Hello.

Looking at the Orion 180mm for imaging moon and planets using Mallincam Signature Video Camera. I understand that these scopes provide nice views of solar system objects due to its high f/15. Seems like a challenge is the cooling down, I live in northern California.. very warm in summer.. 100 F during daylight, high 70's low 80's at night. so do you think the cool down will be long. Again, Im looking to use this OTA for lunar and planetart video imaging. Thanks for any input.. I havnt ordered one yet, but have a few interested sellers..


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Wil2010]
      #5830006 - 04/29/13 12:00 PM

Quote:

Hello.

Looking at the Orion 180mm for imaging moon and planets using Mallincam Signature Video Camera. I understand that these scopes provide nice views of solar system objects due to its high f/15. Seems like a challenge is the cooling down, I live in northern California.. very warm in summer.. 100 F during daylight, high 70's low 80's at night. so do you think the cool down will be long. Again, Im looking to use this OTA for lunar and planetart video imaging. Thanks for any input.. I havnt ordered one yet, but have a few interested sellers..




Good for you! Will you keep it in a A/C house? Then matching a, say 78 degree house with a 70 degree night shouldn't be too bad. Or plan and put it out in a shed, if you have one. Or your basement, if you have one. Or take a look up this thread about the Mak coolers....
I do these with my 14" SCT, which has much more glass than a 150 Mak, and have no problems. But video/imaging is more intense, so if you know this going in, then you'll be prepared. Why don't you go over the the imaging forums and ask for some 1st hand advice there. Of course they'll say, get a refractor or a 5 or 6" SCT..... and it might be better. I'm visual, so that's the place to ask I would say.


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Wil2010
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5830490 - 04/29/13 03:16 PM

I can keep it out in the garage.. garage is in the shade... I was thinking
the 180mm Mak because of the feedback on its excellent performance with lunar and planetary.. so I was assuming it would be best for video imaging.. from what I get from your post, maybe not??


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Wil2010
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5830491 - 04/29/13 03:16 PM

I can keep it out in the garage.. garage is in the shade... I was thinking
the 180mm Mak because of the feedback on its excellent performance with lunar and planetary.. so I was assuming it would be best for video imaging.. from what I get from your post, maybe not??


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Wil2010]
      #5830698 - 04/29/13 04:53 PM

Quote:

I can keep it out in the garage.. garage is in the shade... I was thinking
the 180mm Mak because of the feedback on its excellent performance with lunar and planetary.. so I was assuming it would be best for video imaging.. from what I get from your post, maybe not??




[/list]

I really don't know because I'm only visual, and the guys that I know who do AP use a refractor or a SCT. BUT then again, I've never even seen a f/15 Mak in person before. I suggest you either start a new thread with that in the title here in this Cat and Casses forum, or go over to the AP section, Video forum and do a search or start a new thread over there.
Perhaps someone else here might answer.......


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Wil2010]
      #5831713 - 04/30/13 07:59 AM

I keep mine in garage! I put my 180mm Mak-Cass outside for a few hours and no problem. Seeing is depends on how good night is and planets. Saturn is not great when its low in west in late evening but I can see Cassini's Divsion and band easily at 245 power. When Saturn, Mars and Juipter is high in the sky then view is great! Dont blame telescope!
Glad you order your 180mm Mak-Cass and let us know about your first light! Have fun!


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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5831721 - 04/30/13 08:03 AM

I like f15 for planets and moon because just 10mm eyepiece would be 270 power! I rather to use 8.8 to 14 mm eyepiece than 3 mm eyepiece or barlow!

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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5885754 - 05/26/13 03:13 PM

Well I should have my Mak-Cass by June 4th.

Which 1.25" EPs (plossls I would assume?) would you guys suggest over 25mm?

Thanks
Bob


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orion61

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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5885836 - 05/26/13 04:16 PM

I still love my RKE eyepieces in mine, they give amazing Planetayr and Double on axis brightness and sharpness.
I love my 12mm on Saturn.
Congrats.. you'll love it..


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5885856 - 05/26/13 04:34 PM

Quote:

Well I should have my Mak-Cass by June 4th.

Which 1.25" EPs (plossls I would assume?) would you guys suggest over 25mm?

Thanks
Bob




btw, I have a 27mm RKE too. But I was wondering if a 32mm Baader Plossl or 32mm GSO would be helpful. I'll only be using a red dot finder on a GO TO mount. Would a 40mm be ridiculous to consider? Its a 2700mm f/l.......
Thanks as always,
Bob


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Illinois
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5886660 - 05/27/13 08:32 AM

Why you want lower power? Use refractor or dobsonian. Mak-Cass is great for between 100 and 250 power. Yes, you cam use 40mm eyepiece and I have 40mm eyepiece. Its about 67 power but I use Mak-Cass for planets and Moon. At least 100 power for best view! I rare use as high as 400 power because the view is blur and depends on how good night is.

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azure1961p
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5886732 - 05/27/13 09:34 AM

There are a lot of deepsky objects suitable for a Mak where plenty of folks will use 100x per inch to good effect. Stephen Janes Omeara has used close to that with his 5" apo on planetary nebula. I know it breaks all the *rules* but they claim and I believe, that super high power on high surface brightness objects like planetary nebula actually shows more despite the overextended image scale as the skotopic vision reception of the eye-brain can better resolve image contrasts and such. So at anyrate it'd seem then that the Mak would be well suited here on these deepsky objects. Galactic nuclei can benefit just as much . Then there's double and multiple stars which would play into the maks strong points as well as open clusters where there are more that are small than large and a first rate diffraction pattern can go a long way in ferreting out the fainter members.

I think in its performance envelope the Mak can be an excellent deepsky instrument . Alas though often folks want the sprawly low power views and that doesn't play into the maks strengths when you want to maximize this potential.

Pete


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5886740 - 05/27/13 09:43 AM

Quote:

Why you want lower power? Use refractor or dobsonian. Mak-Cass is great for between 100 and 250 power. Yes, you cam use 40mm eyepiece and I have 40mm eyepiece. Its about 67 power but I use Mak-Cass for planets and Moon. At least 100 power for best view! I rare use as high as 400 power because the view is blur and depends on how good night is.




Hi Illinois- thanks for the introspective question...'Why do I want lower power?'. Even though my intended use is for the planets and moon, most likely 95% from my backyard, I can't go out and ignore compact bright DSOs. I like to experiment in what I can see with each scope that I have, regardless of its intended use. If it works, then great, I see something from a different type of equipment. So that's the reason I ask.
So what specific EP do you have above 25mm? Is it a Plossl? Brand?
BTW, I was out last night with my 102mm f/l 1000 achromat observing Saturn with up to a 5mm (200x) EP. Image started to break down after my 7mm (142x). But clearly saw the Cassini division and a brown band on the planet. All this from a white zone. Amazing little scope when used with great diagonal and Orthoscopics, Pentax's and Sterlings....but also went DSO searching...mostly globulars. Love this hobby!


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Illinois
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5888485 - 05/28/13 08:14 AM

I like Explore Scientific 82 degrees 14mm, 11mm and 8.8mm eyepieces for my Mak-Cass. I use Tele Vue 40mm Plossl but I don't use it often. 20mm is also good. I use 14mm most of the time because its 193 power is just right for most of the time. I rare use ES82 6.7 because its 403X. I did test on 8.8 and 6.7 eyepieces on Juipter and Mars. Details is not much different!

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orion61

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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: Illinois]
      #5889946 - 05/28/13 10:59 PM

Which ever eyepieces you use, you have one of the best
Type and size tubes ever built, like my meade 7" a Classic
built to last a lifetime.


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garneroutlaw
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Reged: 03/28/13

Loc: Northeast Florida
Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: orion61]
      #5933311 - 06/21/13 04:46 PM

After owning my Orion Mak-Cass for about 6 months, I am very much impressed. In the winter months it took some time to cool down, but now that it's summer time it is not much of a deal anymore. I took my first photos two nights ago under poor imaging conditions and to my surprise it pulled out many fine details from Saturn including Enke's division. It outperformed my buddy's 11" SCT in planetary imaging even in the poor conditions. I may have gotten a very good scope, but from what it sounds like this scope being very good is the norm.

For visual observing, I use Celestron Plossls. The standard plossls outperform all my other eyepieces on this scope. As for a dual speed focuser, I would stay away from the Zhumell bargain dual speed SCT focuser. They are practically useless. I'd spend the extra $100-200 and get a better one.


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spongebob@55
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: garneroutlaw]
      #5933536 - 06/21/13 07:12 PM

Quote:

After owning my Orion Mak-Cass for about 6 months, I am very much impressed. In the winter months it took some time to cool down, but now that it's summer time it is not much of a deal anymore. I took my first photos two nights ago under poor imaging conditions and to my surprise it pulled out many fine details from Saturn including Enke's division. It outperformed my buddy's 11" SCT in planetary imaging even in the poor conditions. I may have gotten a very good scope, but from what it sounds like this scope being very good is the norm.

For visual observing, I use Celestron Plossls. The standard plossls outperform all my other eyepieces on this scope. As for a dual speed focuser, I would stay away from the Zhumell bargain dual speed SCT focuser. They are practically useless. I'd spend the extra $100-200 and get a better one.




yes, I agree about the quality of the views. I too looked at Saturn at first (and only) light so far. Low in the sky, white white zone, hazy and WOW, what detail. Had a great, albeit short, night.
Have to do some research/fact crunching on some more eyepieces. Thinking of a 32mm plossl and /or a 20mm 68* or 14mm 82* ES. All 1.25"
I'm now trying to figure out which 2 speed focuser for it....either a Moonlite or a Feathertouch. Input for me anybody?


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Asbytec
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Re: Orion 180mm Maksutov-Cassegrain Questions new [Re: spongebob@55]
      #5934142 - 06/22/13 06:24 AM

For me, it is about the views. I really love my Mak and have been trying to understand why.

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TCW
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Re: I have the SkyWatcher 180mm f/15 new [Re: moynihan]
      #6240136 - 12/08/13 01:15 AM

As far as I can tell Orion does not sell a dew shield for their Maks. Anyone know of a source?

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eyepiecedropper
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Reged: 12/31/11

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Re: I have the SkyWatcher 180mm f/15 new [Re: TCW]
      #6240225 - 12/08/13 03:57 AM

HI, maybe itīs blasphemy....I use the baffled dewshield of my Intes MN76. Fits perfectly. Before that I used an 8" Orion flexishield with an additional velcro tape (the female or male part) sewed on by a saddler. So I can use it with 8" and 7".

Best regards,
Martin


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iluxo
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Re: I have the SkyWatcher 180mm f/15 new [Re: eyepiecedropper]
      #6240244 - 12/08/13 04:37 AM

Make one, it's not hard. Mine is made of 1mm aircraft grade birch ply. If you have a router, make two rings that will serve as formers, wrap the ply round them, glue and varnish or paint to match your scope.

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Bruno Yporti
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Reged: 03/01/11

Loc: Brazil
Re: I have the SkyWatcher 180mm f/15 new [Re: iluxo]
      #6240352 - 12/08/13 07:57 AM

I have a dew shield from AstroZap, works great for Mak180. I bought one for my C8 too.

Edited by Bruno Yporti (12/08/13 07:59 AM)


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Illinois
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Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: I have the SkyWatcher 180mm f/15 new [Re: Bruno Yporti]
      #6240374 - 12/08/13 08:20 AM

AstroZap? Interesting and I will look at it! Thanks!

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