Re: ATM Schiefspiegler

[Anthony Stillman <atmer@flash.net>]

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Might as well make it challenging and have it be cut from a freshly
figured 127.5" ROC, bright and shiny convex mirror of equal diameter to the
primary ;-)

Randy Johnson
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Parenting the primary and secondary of a Schiefspiegler is a great idea.  A
couple of things to consider would be protecting the the polished surface
during the core-ing operation and minimizing the change in figure due to
core-ing.  I haven't read much about optical surface protection scheams,
but I seem recall seeing somthing in one of the ATM series books.  As for
controlling figure, I would suggest cutting the primary somewhat bigger
than is needed and blacking out the extra annulus.  I would cut the
secondary oversized also, then carefully edge it (keep it cool, use finner
grit,...)  to deal with its intrusion into the optical path.  If I really
wanted to go over the top I would polish the edge of the part to releave as
much induced strain as possible.

Boy, and I've got the perfect piece of glass for it too.  Now if I only had
four more hours a day, then I've have something.

Anthony