Re: [ATM] Mersenne (was : Looking for information on a telescopedesign)

["Tony Owens" <towens@shibumi-consulting.net>]

Hi Richard,
Would you by any chance still have that raytrace model on hand?  How about
you, Roger C?  I'd be interested in modelling both the Cassegrain and
Gregorian configurations of the Mersenne in Synopsys or OsloLT and having a
look for myself, but see no point in re-inventing the wheel if you guys have
abready done this!

Best

Tony Owens (Ireland)

>Hi Scott,
>
>For me, it's more than a matter of comfort, it's a necessity. I spend all
of my time >out of doors in a wheelchair. I've been studying low level
eyepiece designs to quite >some degree. The Mersenne was top of my list. It
seemed the ideal solution - turn >the beam into a much smaller afocal beam,
do whatever you want with it, and view >it in comfort with a decent small
instrument. Then I ray traced it and discovered >exactly the problem that
Vlad is talking about. I admit it is influenced by where you >put the system
stop, but for me it was as a complete show stopper.
>
>No, I haven't looked *through* one, but I don't see how that has the
slightest >relevance. The importance to me is that I've looked very
carefully *at* it, and it has >a big draw back. If you can minimise the
distance from the secondary to the >viewing instrument you can minimise that
drawback, but then you may as well use >a simple diagonal mirror and
focuser.
>
>-- 
>
>Best regards,
 > Richard in the UK

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