From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


The Dall-Kirkham is a nice design only in that it is relatively easy to
build.  I'd rather do a Gregorian design than a Dall-Kirkham as the
aberrations will be less.
The decision to do a Naysmith design is a good one and will decouple the
focal plane from the need to get behind the primary, thus allowing somewhat
lower magnifications without the larger secondaries needed.  You do still
run into the problem of the tertiary starting to mask off the secondary
obstruction in the primary.
The meter size is a very large instrument (look at how big the Yard Scope
is and you will understand) and you will probably quickly find a piece of
land up in the mountains where you can put an observatory and keep the
scope there permanently.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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