William asked:
> What is this reflex mirror lens? And what is the term Catatrioptic
mean?
and Chuck replied
> Reflex simply means ....
followed by about 20 pages of astrophysics!
Thanks Chuck, I had a vague idea of how the things worked but
certainly didn't know all that detail. It's a very clear explanation,
although maybe your use of the word "simply" in the opening sentence
was a little out of place :))
John
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