Re: ATM Paracorr with F2.8 parabola

[Andy Saulietis <iss@pvtnetworks.net>]

Re,

>Very interesting and an easy way to make a fast CCD astrograph without
>having to make the corrector yourself. I suppose that fiddling with the
>conic constant of the parabola could make it even sharper in the center.

True, but the usable linear field will be limited to <25mm
diameter due to vignetting at this fast f ratio; ok for
most CCD's but not usable for 2 1/4 film.



Andy Saulietis
ISS Enterprises
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