Re: ATM Focuser Baffle and Dall Kirkham design with Naismyth Focus

["Bob May" <bobmay@nethere.com>]

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@nethere.com
NEW! http://bobmay.astronomy.net