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Re: [ATM] Classical Cassegrain or Dall Kirkham ?????????

Welcome Vimal!

Regards,

Gary Fuchs
USA

>
>Hi all,
>
>First to introduce my self, I'm Vimal. M. From Mumbai (India) and I'm interested in ATM very much. Currently I'm working on 6" f/8 and 15" f/5.
>
>One of my friend and I'm also planning to build a catadioptric, preferably around 12" or 14" diameter. Anybody with previous experience on the same, pls. tell us which design to go for out of the three?
> 
>1)      Ritchey Chrétien
>2)      Dall Kirkham
>3)      Classical Cassegrain
> 
>We understand it is difficult to figure the secondary. The easiest & safest type would be a Dall Kirkham but the focal ration has to be around F/15 + .  we would rather prefer to make a Classical around F/12 .
> 
>pls. note that we don't get Pyrex easily in India (specifically in larger size and smaller disks also are too expensive). and plate glass is available with max 3/4" to 1" thickness.
>
>Can anybody suggest the best solution ? and pros and cons of each. 
>
>Regards,
>
>Vimal Mamania
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