[ATM] additional lurie-houghton degrees of freedom

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

I was just doing some playing around with OSLO and my 8" f/5 Lurie-Houghton design. I found that you have to keep surface # 1 and surface #2 very, very close to each other; if they are one inch apart, the spot diagrams go downhill pretty fast. But if R2 and R4 are as much as 5 inches different, there seems to be essentiall no change in the spot diagrams AFAICT.

Here's the basic one I am using, with BAK4 glass for the corrector plates, all in inches:

surface    ROC    thickness   aperture radius composition
1          71       .7             3.75         bak4
2          -241      .1            3.75         air
3          -71       .4            3.75         bak4
4          241       36            3.75         air
5          -80       -33           4            reflection
6          diagonal mirror

Guy





Guy  Brandenburg
Washington, DC
My home page on astronomy, mathematics, education:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
or else http://tinyurl.com/r6fh2
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