Re: A nice, cheap Cassegrain telescope system

Looks nice, but the wavefront quality is not impressive:
0.05 wave RMS at 633nm becomes 0.058 at 550nm -
little better than 1/5 wave p-v of spherical aberration
level.

Also, with that fast primary (~f/1.5) sensitivity to secondary
decenter is extraordinary: as little as 0.05mm decenter
would result in ~1/2.4 wave of coma (1/4 wave of s.a. level)
in the very center of the field. Not for me...

Vlad

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