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Re: [ATM] Cassegrain vs. Gregorian (secondary testing)
Maybe the following would be useful:
# R t G D conic
OBJ Infinity 406.9481 10 0
STO Infinity -1.271351 83 0
2 677.9661 9.1 SF5 100 0
3 227.6867 17 BK7 100 0
4 -303.306 0.1 100 0
5 303.306 17 BK7 100 0
6 -227.6867 9.1 SF5 100 0
7 -677.9661 0.1 100 0
8 605.9903 -0.1 MIRROR 84.56685 -2.344241
9 -677.9661 -9.1 SF5 100 0
10 -227.6867 -17 BK7 100 0
11 303.306 -0.1 100 0
12 -303.306 -17 BK7 100 0
13 227.6867 -9.1 SF5 100 0
14 677.9661 1.271351 100 0
15 Infinity -406.9481 84.65861 0
IMA Infinity 10.45819 0
The two lenses are listed by ZEMAX as Rolyn Optics 22.0475, 100 mm
f/5 achromats. The Rolyn website lists a 22.1475 or 20.1475. The
net travel center to edge in the test is now only about 2-1/4 mm,
so that should be within the range of many micrometers.
I checked the delta with a mirror conic of -2.3. It amounts to
about 80 nm profile difference at the edge of the mirror. The
change in center to edge distance in the test is about 30
microns. Reasonable?
I guess the greatest difficulty would be, given a pair of lenses,
accurately modelling the test setup. Oh and the price... Rolyn
lists each lens at over a grand!!!!
P.S,: The Rolyn website is:
http://www.rolyn.com
--
Rick S.
http://users.rcn.com/rflrs
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