Re: [ATM] Cassegrain vs. Gregorian (secondary testing)

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Bob May wrote:
 > Decent start for a page.  Now lets have the formulas and so forth so 
that we
 > can see what is needed for the two doublets of the test lenses.

Actually, as it turns out, if you have a fairly monochromatic source,
the doublets may be singlets; the favored form is plano-convex, with
the curved sides facing each other.

Also, as it turns out, the calibration setup pretty much subtracts the
lens set out of it.  I was actually quite pleasantly surprised with
the outcome.

Oh, yes.  I added some equations:

	http://users.rcn.com/rflrs/sectest.htm
-- 

Rick S.

http://users.rcn.com/rflrs


_______________________________________________
ATM mailing list http://www.atmlist.net/