Re: [ATM] 8" Astrograph

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

Paul Lind did an astograph about 15 years ago and reported it in an issue of
ATM magazine.  I managed to get the source code of the program that he used
to design it and updated it with a better interface.  You'll find the
program on my website.  It will design an astrograph with a fairly large
format for the film and 35mm will be a snap for it.
The problem in optics is that as you get rid of coma in a system such as
that, the spherical aberration and the astigmatism will fight with each
other to become the major problem left.  Considering that the camera
actually doesn't need to be perfect to the Airy Disk situaltion (the grain
of the film is a lot larger than the Airy Disk for any decent sized scope)
means that SA can be used to an advantage to more fully illuminate the grain
of the film.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net


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