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Mak vs Schmidt

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Mak vs Schmidt

Postby kb1000 on Fri Jul 17, 2009 11:44 pm

Hi - I'm shopping for my first scope and was told that a 7" Mak-Caasegrain would rival a 9.25 and even an 11" Schmidt Cassegrain for both planetary and deep sky viewing. I know that bigger aperture is better as a general rule so I'm confused. Can I really scale up a 7" with eye pieces that significantly and is the Mak's clarity really that much better?
Thanks in advance.
kb1000
 

Re: Mak vs Schmidt

Postby Jne_K on Mon Jul 20, 2009 7:59 am

Hi

Yes, it will but there are more serious issues with a 7" Mak and that's why Meade dropped it. Due to the much thicker corrector plate, weight is almost impossible to deal with and, much worse, cool down time on a 7" Mak is much, much longer than even a large 10" SCT. If you want to use a 7" Mak in the winter, cool down time will be measured in hours!
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Re: Mak vs Schmidt

Postby kb1000 on Tue Jul 21, 2009 10:19 pm

Thanks a ton Joanie - immensely helpful for a rookie.
Cheers.
kb1000
 

Re: Mak vs Schmidt

Postby Jne_K on Wed Jul 22, 2009 5:30 am

You are very welcome. If you are going bigger than 5", a Schmidt-Cassegrain is much more practical for those very reasons.
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Re: Mak vs Schmidt

Postby roger w on Thu Sep 17, 2009 12:13 am

I was close to deciding on a Vixen VMC200L, until i (fortunately) read this string about the cool down time problems with Maks. But Vixen's literature mentions their VMC200L addresses this cool down time issue. Do you believe that's true, or is there still a cool down difference which justifies a SCT instead?

Thanks much!

Roger
roger w
 

Re: Mak vs Schmidt

Postby Jne_K on Thu Sep 17, 2009 5:53 am

Hi

I haven't heard any reports on that Vixen in terms of cool down time, one way or the other, but it really is your only option if you want a large aperture Mak.

One other possibility is the Meade ACF, which will give you excellent correction across the field and still have excellent cool down time. It is still a Schmidt-Cassegrain at heart and avoids the thick corrector plate of a Mak.
Thanks for posting with us
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Re: Mak vs Schmidt

Postby Guest on Thu Sep 17, 2009 11:37 am

Thanks much for the help!
Guest
 

Re: Mak vs Schmidt

Postby Jne_K on Thu Sep 17, 2009 11:59 am

You are very welcome
Thanks for posting with us
Joanie K - Your personal optics expert

Forum: http://www.opticsplanet.com/msgboard
Blog: http://blog.opticsplanet.com/
Store: http://www.opticsplanet.com/

Phone: (800) 504-5897
Fax: (847) 919-3003
Jne_K
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Posts: 7665
Joined: Wed Sep 24, 2003 3:09 pm