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I've looked through a few. They had an F4 approx -0.7 conic constant primary and a 4X magnification secondary.
I actually worked at the AOS manufacturing facility from 1985 to 1988 but didn't see any any equipment suitable for final wavefront number ratings on Cassegrains in a null test ( not that thats needed but I always wondered where the advertised numbers came from ) . I would take each instrument on its merit if one comes up second hand and arrange a viewing under real skies.
Last edited by Satchmo; 15-10-2007 at 10:37 AM.
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