Re: [ATM] 32" Focal ratio

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

First off, I'd not bother with the secondary unless you have
severe space problems.  Being an imaging scope only, I'd just put
the camera where the focus is and be done with it.  Insulation
and transfer of heat out from the camera, of course, will be
quite necessary but that is what water cooling is for.
Use a focal length as appropieate for the pixel size of the
camera and that is where things will be.  Correctors can be of
any of the various ones that have been put out in the literature.
I do have a fairly simple program which allow interactive design
of astrograph correctors  that Paul Lind did most of the work on
on my website in the software section.  You can use it to
evaluate the various designs (it allows a 2 element corrector and
the primary conic constant can be changed as desired) that are
out there for aberrations at the edge of the field.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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