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


Draw out on a large piece of paper the design of the scope and setup the EP
FOV on the axis as if the tertiary wasn't there - this makes drawing lines
easier.  When you start drawing the lines, draw a set of on-axis lines, a
set of off-axis lines to at least the secondary and hopefully to the
primary (half degree angles do get to be a bit weary to draw and the
obstruction between the primary and secondary will be minimal anyway) and
use that drawing to size the baffles on the secondary and tertiary and the
size of the tertiary mirror for best results.  You also want to use the
full 2" of the EP as the FOV to insure the best results with the
baffles although you may also desire to drop that down to about 1.6"
which is about the largest that you really get in a FOV on a 2" EP.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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