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Equipment Discussions >> Refractors

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
AP 178 f/9 Questions
      #5817265 - 04/23/13 11:33 AM

Hi Folks - I have turned over my fleet of scopes and am about to take delivery of an AP 178 f/9 - white tube. I have a couple of questions about the 178 in particular and big refractors in general as well.

For the 178, I know that some of them were air-spaced. From what I have read, all blue tubes are oil spaced, and the only air-spaced were white tubes. But - I am not sure if ALL white tubed 178's were air spaced or if just the last few produced white tubes were. Can anyone tell me?

I just took delivery of an AP152 f/12 as well. These two refractors represent by far the largest I have ever seen in person and while I have a G11, I am wondering if I should get something bigger and use a portable pier as opposed to the G11 tripod. I do not have the option of a permanent set up so these are grab and go scopes for me!

Any tips, recommendations and advice from current or past owners of these rare beasts would be much appreciated. Cheers!


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5817293 - 04/23/13 11:48 AM

Did you buy the 152/12 from Astromart recently? It was mine before and it was a superb scope. I have a few pics of it online.

The 152/12 is a lot for a G11, the moment arm is healthy. It will work though. The 178/9 is over the line for the G11 (IMHO) it will flex the mount for sure.


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5817309 - 04/23/13 11:59 AM

Yes Mike! I was told it was your scope and I was very happy to hear that. I saw your pictures online before I found out it that this particular scope was yours. It is in terrific condition and I am very psyched to use it.
As for the mount question, I was thinking I might be able to pick up an old AP 800 for the 178 if I found out the G11 was borderline. I am open to and interested in any recommendations.


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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5817406 - 04/23/13 12:57 PM

The G11 will be overwhelmed by the 178. The 6" f/12 won't be much better. Also be prepared for the eyepiece to be too low for comfortable use when aimed high, even if you have a 5' tripod.

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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817437 - 04/23/13 01:07 PM

Congrats on getting the best version of a 152/12 that AP ever made. I had some real modern-APO FPL-53 snobs sit down at that scope expecting to see the "Best Of 1994 Planetary" and they always came away thinking - "OH - that's serious. Wait a minute! This is really quite excellent !!"

If you could find an AP900 QMD (probably hard to find now) or an AP900 GTO at some new post-1100/1600-GTO pricing, it would be an ideal kit.


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5817489 - 04/23/13 01:31 PM

LOL! I love it. That'll teach those FPL-53'ers a lesson!
I will look into obtaining a 900. I take it the G11 aluminum tripod can handle it with an extension. I am not going to take any chances and I don't want to under-mount these fine scopes. I should mention that I am strictly visual and have no intention at this point to get into any astro-photography (famous last words). Thanks for the advice!


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817504 - 04/23/13 01:34 PM

Thanks Joe - I am getting a 12" extension but even then I anticipate I will be on my knees - not only because the views will be so great! As a lone observer it'll take some technique to sling these tubes around and prop them up high on the mount. I am glad I asked about this subject and appreciate all this feedback.

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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817512 - 04/23/13 01:37 PM Attachment (34 downloads)

Quote:

The G11 will be overwhelmed by the 178. The 6" f/12 won't be much better. Also be prepared for the eyepiece to be too low for comfortable use when aimed high, even if you have a 5' tripod.




If the G11 is in the same class as a CGE, it should be fine for visual use for the 178. Losmandy sells a 12" pier extension for a very reasonable price ($125, IIRC), which incidentally fits the CGE as well. It makes the 178 clear the legs of my CGE with ease but I did have to put a counterweight on the eyepiece end made from (1) A 7" ScopeStuff ring, (2) a AS-GT counterweight bar extension (0.75" OD), and (3) a 5lb AS-GT weight, as the scope is very front-heavy. Its normal balance point is 2/3rd of the way toward the front.

I've also noticed that viewing from a wooden deck is less stable because the slats flex and introduce a slow jitter. I suppose it depends on the construction but placing the mount on the ground is far more stable.

One thing you might want to be careful about if the white-tube has the same screw-in dew-shield as the blue tube is that the threads on the lens cell are hard to engage because of their size. Having a large piece of metal slip near glass is a heart attack waiting to happen . I'm thinking of storing my metal dew-shield and using a home-brewed Reflectix one. Apart from being more effective, it also lightens the scope and reduces the moment.

Congratulations to the OP on his new scope. The white tubed StarFires are supposed to be the best of the pre-ED AP scopes.

Tanveer.

Edited by Tanveer Gani (04/23/13 01:40 PM)


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: TG]
      #5817614 - 04/23/13 02:12 PM

Thanks Tanveer! Very helpful. I like the counterweight system you put together. I have a 5lb counter weight ring being given to me by the previous owner so I will see how well that works to achieve balance in the meantime. Your pics do a good job illustrating the repercussions of the front heavy design.

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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: TG]
      #5817652 - 04/23/13 02:21 PM

The G11 tripod is not the issue. It's strong enough. The native height of the tripod is 48". Add the extension and you have 5' tripod. This is a good height for my 6" f/9, but is pretty short for anything substantially longer.

I have a different experience with the G11 head. It's good for visual use with my scope, but if it's even somewhat windy it's frustrating at high powers. I've also used a 6" f/12 on a pier-mounted G11 under a dome. It was quite wobbly and unacceptable to me. A 178 would weigh close to twice as much and be unacceptable to me on a G11. Of course different people have different tolerances for that sort of thing. In my opinion a 900-class mount is optimal for these scopes, and mandatory for imaging.


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817665 - 04/23/13 02:28 PM

I used a 175/8 on a G11 and it could best be described as "squirrely" and "spaghettified"

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817738 - 04/23/13 03:03 PM

I am leaning towards finding an old AP900 QMD. The cost is reasonable and I like the fact that it's still pretty portable.

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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5817813 - 04/23/13 03:35 PM

Quote:

The G11 tripod is not the issue. It's strong enough. The native height of the tripod is 48". Add the extension and you have 5' tripod. This is a good height for my 6" f/9, but is pretty short for anything substantially longer.

I have a different experience with the G11 head. It's good for visual use with my scope, but if it's even somewhat windy it's frustrating at high powers. I've also used a 6" f/12 on a pier-mounted G11 under a dome. It was quite wobbly and unacceptable to me. A 178 would weigh close to twice as much and be unacceptable to me on a G11. Of course different people have different tolerances for that sort of thing. In my opinion a 900-class mount is optimal for these scopes, and mandatory for imaging.





I agree that a 900 class mount would be ideal but the blue tube 178 is only about 30lbs (IIRC) and unless the white tube 178 has the newer CNC machined tube, it should also weigh the same. I doubt the 6" f/12 is only 15lbs so your estimate seems off. The f/12 does have a longer moment arm and that I think matters more than the weight. I have no experience of the G11 but supposedly the CGE was built to be a G11 replacement (Celestron had been using Losmandy to source their high end mounts), and I find it perfectly adequate for visual use. At my viewing site, it's almost never windy when it's clear but I can imagine wind being a problem. But just to give a concrete example, I find that vibrations damp down in 2-3 sec if the mount's on the ground and 5-6 seconds if it's on a ScopeBuggy. And I can still focus precisely down to Airy-disk precision without any problems using the standard A-P 2.7" single speed focuser while using a heavy Zeiss Mark V binoviewer + 2" AP barlow.

The CGE has its electronics in a "half pier" that gives a 18" total extension to the tripod but the extension that Losmandy sells is stackable and quite solidly built so if necessary, once could always use two. However, it's always a balancing act between viewing comfortably at zenith vs. viewing comfortably at a lower altitude. The best results, IMHO, are obtained by pushing the center of gravity of the scope toward the eyepiece end by weighing it down (a heavy binoviewer + finder helps here as well) so that the majority of the tube length is forward of the mount.

But if the OP has cash to spare, now that AP has come out with the 1100GTO for $8.8k, I suspect there will be plenty of 900 mounts on the used market soon for nice prices.

Tanveer.


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5817819 - 04/23/13 03:40 PM

Quote:

I used a 175/8 on a G11 and it could best be described as "squirrely" and "spaghettified"




If that's the new AP scope you are talking about I don't doubt it given that it weighs 43lbs. The old 7" pre-ED scopes had regular Al tubes with the OD same as the aperture: 7" and weighed only about 30lbs.

Tanveer.


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: TG]
      #5817826 - 04/23/13 03:43 PM

no it was a TMB175/8... 30 lbs is a lot better but the moment arm will get ya

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John M.
member


Reged: 10/08/06

Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5817861 - 04/23/13 03:55 PM

Regarding the original question... I had a 152 f/9 (received 4/92) that was made just prior to the introduction of the 155 f/9 EDTs. Mine was air-spaced. That was not true of all the 152 f/9s, however. So, I'd suspect that not all of the 178 f/9s were air-spaced........... John

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EddWen
Pooh-Bah


Reged: 04/26/08

Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5817871 - 04/23/13 04:00 PM

Quote:

I am leaning towards finding an old AP900 QMD. The cost is reasonable and I like the fact that it's still pretty portable.




I have a 900QMD I am not using. Pm me if you're interested and I'll dig up some details this evening.


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Eddgie
Postmaster
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Reged: 02/01/06

Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5817888 - 04/23/13 04:12 PM

Sometimes you can find a used Meade LXD 750. These are pretty stable mounts with a large refractor.

You can often find them cheap, but parts (should you need them) are difficult to find.

This was the mount Meade shipped with their 178ED. It is much more stable than the CGE.


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: EddWen]
      #5817914 - 04/23/13 04:28 PM

pm sent - thanks!

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Eddgie]
      #5817918 - 04/23/13 04:29 PM

Thanks Eddgie - I am open to all viable options. I appreciate it. -S

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Paul G
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Reged: 05/08/03

Loc: Freedonia
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5817926 - 04/23/13 04:33 PM

Quote:

I am leaning towards finding an old AP900 QMD. The cost is reasonable and I like the fact that it's still pretty portable.




That's what I would do. There will probably be some coming up for sale, including GTOs, when the 1100 starts shipping.


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rfic1
sage
*****

Reged: 10/25/05

Re: AP 178 f/9 Questions new [Re: Paul G]
      #5817940 - 04/23/13 04:40 PM

Hi Steve,
Congrats! The other less expensive option would be a older AP 800 mount but agree that a AP900 would be a excellent choice.


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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: TG]
      #5817985 - 04/23/13 05:03 PM

According to a previous owner, the 6" f/12 Superplanetary OTA weighs a whole 18 pounds. That sounds about right to me. My scope weighs 23 pounds, and while it has less tube it has a much heavier cell and focuser than those old scopes. So I think my estimate was pretty good.

As I said, different people have different tolerances. You are satisfied with the performance you're getting, and that's great. I wouldn't be.


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Ziggy943
Post Laureate


Reged: 08/11/06

Loc: Utah
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5818548 - 04/23/13 08:01 PM

Quote:

Yes Mike! I was told it was your scope and I was very happy to hear that. I saw your pictures online before I found out it that this particular scope was yours. It is in terrific condition and I am very psyched to use it.
As for the mount question, I was thinking I might be able to pick up an old AP 800 for the 178 if I found out the G11 was borderline. I am open to and interested in any recommendations.




Steve,

A friend also recently purchased a AP 178 recently through Astromart. We tried it on my AP 900 mount and it was fine visually but would have benefited from a 1200 class mount. He didn't have a finder yet so our targets were limited but Jupiter was very good.


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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: Ziggy943]
      #5818574 - 04/23/13 08:17 PM

I didn't expect that, Ziggy. My TMB175/8 was about 50 pounds dressed and it was a great match with the AP900QMD I had at the time. Of course, I just came from a G11 so I might have had stars in my eyes at the time.

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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5818668 - 04/23/13 09:23 PM

Out of curiosity I decided to subject my 1400mm FL scope to some rap tests tonight and time the results. Depending on how I hit the focuser, damping times ranged from 1-2 seconds. The total payload on the mount was about 32 pounds.

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Cotts
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5818768 - 04/23/13 10:19 PM

Before you spend a lot of dosh on a big mount why not try a Hargreaves Strut ?

If the scope's weight is not a problem for your G11 but its length and moment arm are this may be a solution for you for under $100...

At least you could slap one together until you find the right mount.....

Dave


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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: Cotts]
      #5818795 - 04/23/13 10:32 PM

That's a good idea.

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: rfic1]
      #5818878 - 04/23/13 11:11 PM

Thanks Bob! I actually tried to contact a couple of folks on Amart that had older ads for 800's that weren't marked SOLD. I may look into that if they get back to me, especially if I can't put a deal together for an older 900.

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Ziggy943]
      #5818917 - 04/23/13 11:24 PM

I cant wait to get the Superplanetary and the 178 set up. This particular 178s OTA has been cut down for binoviewing so it will be my "cruiser", just scanning the milky way etc. I figured that the 6" will be my go to planetary and lunar machine under the average lousy jet stream ridden skies we have here in New England. It should max out the view on most nights. When the seeing is better, I will bring out the DK 10".
As a visual observer with many cloudy nights and light polluted skies, I decided that I need aperture, the fast cool down times and the ease of use of the refractor, so that I can see all I can with short notice and hectic work schedule. I can always fall back on my excellent tmb 100 for real grab and go. Plus, I couldn't pass up the opportunity to grab these legends as they became available. I will do what it takes to adjust my mounts to accommodate them and I appreciate all of this input.


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Cotts]
      #5818925 - 04/23/13 11:30 PM

Quote:

Before you spend a lot of dosh on a big mount why not try a Hargreaves Strut ?

If the scope's weight is not a problem for your G11 but its length and moment arm are this may be a solution for you for under $100...

At least you could slap one together until you find the right mount.....

Dave




Whoa! That's a new one on me. Thanks Dave!


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JJK
Carpal Tunnel


Reged: 04/28/08

Re: AP 178 f/9 Questions new [Re: TG]
      #5819136 - 04/24/13 05:17 AM

Tanveer, there's no doubt the AP178 will overwhelm a G11.

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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5819801 - 04/24/13 01:24 PM

Quote:

I cant wait to get the Superplanetary and the 178 set up. This particular 178s OTA has been cut down for binoviewing so it will be my "cruiser", just scanning the milky way etc. I figured that the 6" will be my go to planetary and lunar machine under the average lousy jet stream ridden skies we have here in New England. It should max out the view on most nights. When the seeing is better, I will bring out the DK 10".
As a visual observer with many cloudy nights and light polluted skies, I decided that I need aperture, the fast cool down times and the ease of use of the refractor, so that I can see all I can with short notice and hectic work schedule. I can always fall back on my excellent tmb 100 for real grab and go. Plus, I couldn't pass up the opportunity to grab these legends as they became available. I will do what it takes to adjust my mounts to accommodate them and I appreciate all of this input.




Do not underestimate the 178's planetary performance. It will be supurb. Also, consider this, for nights with lousy seeing, you can always stop down the 178 to 6" or even 5".

I'm curious to see it the 178 is air gapped or not. If it is, you got the best of the pre-EDT scopes. I had two of the 6" F9's that were airspaced. Man! NO COLOR! Even racking around focus. However, it will take longer to thermally settle out relative to the oils spaced design.

Also, I've an APM 178 F8 and fully dressed out (with bin-viewers, 60mm finder, aft weight ring and aft counterposie weight), is pushing 50 pounds but my G11 handled it ok for visual use. Vibration was a bit of low frequency rocking but focusing at high power was fine, but like, the others said, wind was the issue. My older Losmandy GM100 was a noticably better match but the AP 900GTO is wonderful. I use the G11 pier with an AP/Losmandy adapter set.

The real issue will be the process you use to install the 178 on the mount, regardless of the mount. But that gets easier the more you weight train using overhead lifts .

Pictures, give us pictures!

Jeff


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SteveG
Post Laureate
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Reged: 09/27/06

Loc: Seattle, WA
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5819833 - 04/24/13 01:40 PM

Quote:

Quote:

Before you spend a lot of dosh on a big mount why not try a Hargreaves Strut ?

If the scope's weight is not a problem for your G11 but its length and moment arm are this may be a solution for you for under $100...

At least you could slap one together until you find the right mount.....

Dave




Whoa! That's a new one on me. Thanks Dave!




Here's another link:
https://sites.google.com/a/astrotasmania.com/www/hargreavesstrut


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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: SteveG]
      #5819863 - 04/24/13 01:56 PM

Thanks for the link Steve. That makes it even clearer.

Jeff B - I will send pics as soon as I can get these birds off the ground. If I can get some tastey views of the planets and luna with the 178 bino-viewed - so much the better! Man this is going to be awesome, having these scopes. anticipate receiving the 178 next week. It does get pretty windy quite often here in Central MA. I am really leaning towards a used AP 900 QMD which would also hold my DK 10" in addition to the two AP's. I am looking into getting an adjustable portable pier as well that I could affix to castors for ease of movement. I love the idea of the adjustable height portable pier to save me from having to step up to mount the scopes. I am 5'11" and while I am not too worried about lifting the weight, I am concerned about the awkwardness due to the length. I don't have any observing buddies locally so I need to make this process as user-friendly and fool proof for one person as possible. I must admit thought, once I developed a technique, I was able to mount my 216 mak/newt fairly easily onto my G11, but I didn't have an extension.

On another note, do I need to shine a green laser through the objective to determine air or oil-spaced? If so, can someone tell me what to look for t tell the difference?


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Cotts]
      #5819866 - 04/24/13 01:59 PM

Quote:

Before you spend a lot of dosh on a big mount why not try a Hargreaves Strut ?

If the scope's weight is not a problem for your G11 but its length and moment arm are this may be a solution for you for under $100...

At least you could slap one together until you find the right mount.....

Dave




Good idea. I had actually thought of building one since I had two of the ScopeStuff rings, one of which I used for the counterweight. But the CGE is steady enough for visual use so I never bothered.

I've never used the G11 but I always thought it was equivalent to the CGE. Perhaps I'm not picky enough.

Tanveer.


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Jeff B
Carpal Tunnel
*****

Reged: 12/30/06

Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5819891 - 04/24/13 02:13 PM

Quote:

On another note, do I need to shine a green laser through the objective to determine air or oil-spaced? If so, can someone tell me what to look for t tell the difference?




No, though that's an easy way. You'll see the spacers along the edge if it's airspaced. If the 6" F12 is oil spaced, you can use it as a reference.

Enjoy!

Jeff


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: TG]
      #5819900 - 04/24/13 02:17 PM

Quote:

Before you spend a lot of dosh on a big mount why not try a Hargreaves Strut ?






If needed, I have the parts list from the Sep 2001 Thomas Dobbins article in S&T. The prices have gone up, though. Just the two universal joints will cost you $82 rather than the $24 in 2001.
Tanveer.


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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

Loc: Upstate NY
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5820095 - 04/24/13 03:50 PM

Quote:


On another note, do I need to shine a green laser through the objective to determine air or oil-spaced? If so, can someone tell me what to look for t tell the difference?




You can just look at the lens. If you see multiple reflections of some light source, it's air spaced. If you see only 2 reflections, it's oiled.

I would be surprised if the 178 wasn't superior to the 6" for planets. In fact, the 6" seems redundant to me, unless you just like to collect things.


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Joe Bergeron
Vendor - Space Art


Reged: 11/10/03

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Re: AP 178 f/9 Questions new [Re: Jeff B]
      #5820106 - 04/24/13 03:55 PM

Quote:

the AP 900GTO is wonderful. I use the G11 pier with an AP/Losmandy adapter set.




Do you mean the G11 tripod? You're using it with a 900 mount and a 50 pound load and it works well? I like my G11 tripod, and if I wind up with a 900-1100 mount I'd like to continue to use it, but not if it would compromise stability.


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TG
Pooh-Bah


Reged: 11/02/06

Loc: Latitude 47
Re: AP 178 f/9 Questions new [Re: Joe Bergeron]
      #5820111 - 04/24/13 03:58 PM Attachment (34 downloads)

Quote:

Quote:


On another note, do I need to shine a green laser through the objective to determine air or oil-spaced? If so, can someone tell me what to look for t tell the difference?




You can just look at the lens. If you see multiple reflections of some light source, it's air spaced. If you see only 2 reflections, it's oiled.






The green laser "test" can be surprisingly hard to interpret. I've attached a picture of one done on the oil-spaced version.

Tanveer.


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Mike Clemens
Frozen to Eyepiece
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Reged: 11/26/05

Loc: Alaska, USA
Re: AP 178 f/9 Questions new [Re: TG]
      #5820769 - 04/24/13 08:35 PM

is that the 178? looks awesome ! more pics plz : ) From that era, I believe if it was air spaced it would have clear air spacing tabs every 120 degrees around the periphery.

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gillmj24
Post Laureate
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Reged: 12/06/05

Loc: PA
Re: AP 178 f/9 Questions new [Re: Mike Clemens]
      #5820935 - 04/24/13 10:02 PM

I thought the green laser test was only for fluorite?

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The Ardent
scholastic sledgehammer
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Reged: 10/24/08

Loc: Virginia
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5820953 - 04/24/13 10:11 PM

You were standing two feet away from a 900 QMD this weekend and you didnt buy it?

Quote:

I will look into obtaining a 900.




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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: The Ardent]
      #5821045 - 04/24/13 11:12 PM

No I didn't buy the 900 last weekend. I didn't think I would be going in that direction at the time. I know more now thanks to everyone's input.

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: TG]
      #5821048 - 04/24/13 11:14 PM

I will try this on both scopes, thanks for demo.

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richardlowney
member
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Reged: 12/04/09

Loc: Wisconsin
Re: AP 178 f/9 Questions new [Re: stevenwav]
      #5821467 - 04/25/13 08:40 AM

PM sent

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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: richardlowney]
      #5822202 - 04/25/13 01:40 PM

Agreed on the AP900 - it handles the AP178 for visual with short settle times, solid stability at the eyepiece, sufficient overcapacity to handle heavy accessories & some wind handily.

Will do in a pinch on an EM200, but very fussy and unstable. Have tried both heads on the same ATS pier, it's the head and not the pier/tripod.


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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827784 - 04/28/13 06:19 AM Attachment (37 downloads)

Found some pictures...here's how spindly an EM200 with the massive SE-LL tripod looks under an AP178...

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etsleds
sage
*****

Reged: 11/14/09

Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827788 - 04/28/13 06:24 AM Attachment (36 downloads)

And looking more proper on an AP900...

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mvw
super member


Reged: 03/07/13

Loc: Somewhere in the universe
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827796 - 04/28/13 06:38 AM

Beautiful system.

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johnnyha
Postmaster
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Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5827882 - 04/28/13 08:36 AM

Lookin good Andrew!

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stevenwav
sage
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Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: etsleds]
      #5829364 - 04/28/13 11:48 PM

Yowza - that says it all right there! The 900qmd is almost on its way!

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stevenwav
sage
*****

Reged: 02/06/12

Loc: New England
Re: AP 178 f/9 Questions new [Re: Jeff B]
      #5839221 - 05/03/13 10:30 PM

By way of update- i have finally had a chance to look at the lens closely... Transparent spacers - therefore air-spaced!!
Obviously i am very psyched and cant wait for he 900qmd to arrive. Pics and first light when it does.


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