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Where are the Maksutov-Cassegain people?

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282 replies to this topic

#1 Guilherme1

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Posted 20 August 2015 - 01:41 PM

Hi,

 

There is seldom a reference (at actual times) to Mak-Cassegrains. Be it Intes-Micro, STF, Santel, Synta, Orion or from other makers.

 

It seems a very forgotten scope... But when well made, it is very good.

And, by the way, the "long" thermal adaptation time and the solutions provided?

I have no problems with my Intes-Micro Alter M715 Dx.

 

Regards


Edited by Guilherme1, 20 August 2015 - 01:42 PM.


#2 Burgher

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Posted 20 August 2015 - 01:44 PM

I would like to see Orion bring back its 150mm Mak. I had one several years ago but
sold it and bought their 180mm Mak. Both were exceptional lunar/planetary scopes.
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#3 dweller25

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Posted 20 August 2015 - 01:46 PM

Here is my Intes Micro Alter 715

Attached Thumbnails

  • IM 715.jpg

Edited by dweller25, 20 August 2015 - 04:11 PM.

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#4 macdonjh

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Posted 20 August 2015 - 01:49 PM

My family's first scope is an Orion 4" Mak.  I sits unused at this time as everyone still observing has aperture fever.  Nice little scope, though, and the only one with a solar filter available in our house.


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#5 Eric63

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Posted 20 August 2015 - 03:54 PM

C90 and 127Mak here. The 127 is a little big scope. Not far behind a 6" in view, but much smaller in size. The c90 is a great little grab a go. Cools relatively quick and can be mounted on a light photo tripod.
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#6 Norm Meyer

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Posted 20 August 2015 - 04:39 PM

I like Maks I have four Mak-Cass and one Mak-Newt. The Mak_Cass's are 90mm Meade ,102mm Tasco

6" F12 homemade ota with Intes optics and a 7" Meade. The Mak Newt ota is home made with Intes optics.

The one I use the most is the 7" mainly because it's in an observatory. The 7" has superb optics. On good seeing

I can use 432X with ease on the moon and planets. I would like to try an Orion 7" as it has only 23% obstruction

ratio whereas my Meade has 34%. Maine has few nights with excellent seeing compared to other areas. It seems

to have gotten worse over the last 20 years or so.....or maybe it's my 70 year old eyes.

 

Regards Norm


Edited by Norm Meyer, 20 August 2015 - 04:40 PM.

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#7 Jon Isaacs

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Posted 20 August 2015 - 05:18 PM

Norm

 

Before you go out and buy that Orion. Verify the size of the CO. According to the Orion website, the 127 Starmax  has a 38 mm CO which makes the CO, 33%. That's the size of the secondary mirror. The actual CO includes the baffle which I measured at 48 mm which, in combination with the working aperture of 121 mm makes the CO 40%.

 

Jon



#8 Paul G

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Posted 20 August 2015 - 05:28 PM

17951023-lg.jpg

 

AP 10" Mak-Cass f14.6, 23% co, permanently collimated, coma free, rapid cool down.


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#9 JohnH

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Posted 20 August 2015 - 05:55 PM

Im an owner of an M809 (8" f/10) Intes Micro but it doesn't get much use any more as the 7"  MN-76 is really good.

 

I plan on building a 10" or 11" in the near future.



#10 Norm Meyer

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Posted 20 August 2015 - 06:24 PM

Jon,

I wasn't planning  to go out and get an Orion 180 any time soon. I was just going by Orion's

specs. I didn't see anywhere where it said if it were a Gregory design or a (preferred) Rumack.

It appears the secondary is an aluminized spot on the meniscus lens which would make it a Gregory design.

Telescopes are like a disease for which there is no cure. But I keep on looking for one

that will cure me of wanting another one.

 

http://www.telescope...c/18/p/9969.uts

 

Regards Norm



#11 hardwarezone

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Posted 21 August 2015 - 02:33 AM

Used the year2012 c90 #52268 for a year before selling it and upgrade to mak127.

 

In other forums where potential buyers note they are considering to get a small mak for landscape viewing , I would advise them to get a wide field refractor instead.


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#12 dotnet

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Posted 21 August 2015 - 05:03 AM

I bought an Intes MK-67 in 1999, and to this date it has been my primary scope. I've also got a Dob and a small refractor (see my sig) but I virtually never use them. The 6" Rumak is as close to perfection as I will likely ever get.

 

I believe one of the reasons the Maks (especially the Russian ones, which are superb) are not talked about much is that they don't get advertised and thereby don't get a lot of mindshare. They also don't show up very often in the classifieds. Lastly, most people seem obsessed with wide field viewing. Maks are not made for that. I care just about enough about wide field to use a pair of binoculars once in a while, for me high-magnification narrow field is where it's at :)


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#13 Sarkikos

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Posted 21 August 2015 - 07:08 AM

Maks tend to be longer, heavier, slower to cool and more expensive than comparable aperture SCTs.  So there is that.  

 

I've had Maks and SCTs.  The 90mm Maks are an exception to the above general rule.  But has anyone ever seen a 90mm SCT? 

 

Mike


Edited by Sarkikos, 21 August 2015 - 07:08 AM.


#14 Sarkikos

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Posted 21 August 2015 - 07:12 AM

Hi,

 

There is seldom a reference (at actual times) to Mak-Cassegrains. Be it Intes-Micro, STF, Santel, Synta, Orion or from other makers.

 

I don't know ... there have been plenty of long threads about the C90.  I sold mine a year ago.  I'm thinking about buying another one.  I have a MicroStar mount that's just waiting for that scope.

 

Mike


Edited by Sarkikos, 21 August 2015 - 07:14 AM.


#15 coopman

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Posted 21 August 2015 - 08:31 AM

Sky-Watcher is now manufacturing 180mm and 150mm Maks.

#16 KevH

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Posted 21 August 2015 - 08:36 AM

Norm

Before you go out and buy that Orion. Verify the size of the CO. According to the Orion website, the 127 Starmax has a 38 mm CO which makes the CO, 33%. That's the size of the secondary mirror. The actual CO includes the baffle which I measured at 48 mm which, in combination with the working aperture of 121 mm makes the CO 40%.

Jon

I've seen it posted that the Synta 180 mak has a conical baffle that increases the obstruction to around 30%. What I haven't seen is if the 180 is also working at a reduced aperture like the smaller Synta maks.

Edited by KevH, 21 August 2015 - 08:37 AM.


#17 Eric63

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Posted 21 August 2015 - 08:53 AM

Norm


Before you go out and buy that Orion. Verify the size of the CO. According to the Orion website, the 127 Starmax has a 38 mm CO which makes the CO, 33%. That's the size of the secondary mirror. The actual CO includes the baffle which I measured at 48 mm which, in combination with the working aperture of 121 mm makes the CO 40%.

Jon

I've seen it posted that the Synta 180 mak has a conical baffle that increases the obstruction to around 30%. What I haven't seen is if the 180 is also working at a reduced aperture like the smaller Synta maks.

If the tube diameter is close to 180mm, then it is working at reduced aperture.

#18 Sarkikos

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Posted 21 August 2015 - 09:48 AM

Folks should stay away from the sub-90mm Maks.  Barely usable toys, or so I hear.

 

Mike



#19 gene 4181

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Posted 21 August 2015 - 11:11 AM

   I have a 6in orion mak , the older I get, the more I  like it.  I also have a 102 lomo mak-newt , another very nice scope , especially widefield.  As far as the mak-cass is concerned , i'm finding most of what I look at , a nearly 1 degree fov is acceptable most nights and finding stuff with the telrad is acceptable on my az 4 . Its the scope that I can carry out one handed without rearranging the door jambs on the way. 


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#20 Sarkikos

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Posted 21 August 2015 - 11:16 AM

I like my C5 for best compromise of aperture and grab-n-go portability.  It's an SCT.  I can carry it out and down my porch steps in one hand.  It rides on a 501HDV on Bogen tripod.  Though there is the cool-down problem for planet/lunar.  My C90 Mak used to be my favorite grab-n-go Moon scope, but I sold it.  

 

Often I just take out a C80ED.  Virtually no cool-down time and tack sharp with excellent contrast. 

 

The largest scope I can carry out in one trip is my EdgeHD 8" on a NexStar goto mount.  That's definitely a two-handed setup.

 

Mike


Edited by Sarkikos, 21 August 2015 - 11:20 AM.


#21 Richard Whalen

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Posted 21 August 2015 - 11:32 AM

I've had my 8" f15.5 Tec since 2000, about as perfect optics as you can get. It gives better images than most large APO's I've compared it with once it cools down or warms up. Not much of an issue here in Florida unless it is left out in the sun all day. No coma, pinpoint stars to the edge on a inky black background. Real contrast monster. 100x per inch when seeing permits is just loafing along.....20141217_004232_resized_3.jpg


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#22 Jon Isaacs

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Posted 21 August 2015 - 01:08 PM

Jon,

I wasn't planning  to go out and get an Orion 180 any time soon. I was just going by Orion's

specs. I didn't see anywhere where it said if it were a Gregory design or a (preferred) Rumack.

It appears the secondary is an aluminized spot on the meniscus lens which would make it a Gregory design.

Telescopes are like a disease for which there is no cure. But I keep on looking for one

that will cure me of wanting another one.

 

http://www.telescope...c/18/p/9969.uts

 

Regards Norm

 

Norm:

 

I know what the specs say..  They use the same phrase for the 127 and the 180.. Secondary mirror obstruction..

 

However, in the case of the 127 and most likely the 180, that is misleading because the actual central obstruction includes the secondary baffle..

 

As far as a disease without a cure.. I have the telescopes I want but sometimes one comes along that seems like it might be a nice addition or maybe too good a deal to pass up. I am not a Mak guy but the 127 was too good to pass up. 

 

Jon



#23 Vondragonnoggin

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Posted 21 August 2015 - 01:32 PM

I have two iOptron 150 maks. Ironically enough with all the hoopla about CO size, I haven't heard too much from actual owners of MC's in the complaints department in regards to CO. Everyone seems to say sharp contrasty views.

 

What I particularly like about mine is the heavy duty build and sharp contrasty views and the way it takes 2" eyepieces with ease. It has given me some of the best planetary views I have seen yet from my backyard. Even over my 8" dob. Mostly due to steady views after proper cooling, which takes a rather long time unassisted by my Lymax or set out ahead of time long enough.


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#24 Sarkikos

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Posted 21 August 2015 - 01:37 PM

As far as a disease without a cure.. I have the telescopes I want but sometimes one comes along that seems like it might be a nice addition or maybe too good a deal to pass up. I am not a Mak guy but the 127 was too good to pass up. 
 
Jon

 
How does the 127 Mak compare to a C5?  I've steered away from a 127 Mak because I understood it would be heavier, cool down slower and have a smaller TFOV.   Of course, It might have some redeeming virtues.
 
Mike

Edited by Sarkikos, 23 August 2015 - 06:37 PM.


#25 Jon Isaacs

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Posted 21 August 2015 - 01:43 PM

I have two iOptron 150 maks. Ironically enough with all the hoopla about CO size, I haven't heard too much from actual owners of MC's in the complaints department in regards to CO. Everyone seems to say sharp contrasty views

 

 

I can only comment on the Starmax 127. Compared to the 120 mm Orion Eon F/7.5 ED doublet, the view are markedly less contrastly and doubles are not as sharp or bright.  It's not unexpected, a simulation using Aberrator shows something similar.

 

Jon


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