[ATM] mirror cell design

["Jerry B. Hillman" <JBHillman@ev1.net>]

Hi All,
Can anyone point me to a version of Plop that supports 54 point cells.  I am
currently using a 27 point cell but am having difficulty with astigmatism.
During one test session I will have perfect, astigmatism free results, then
the next time I set it up, I will have astigmatism.  Resetting the mirror
and recollimating will either produce astsigmatism free star test images, or
astigmatism of a different variety, along a different plane, or of a
different degree.  This all appears to be releated to the mirror cell, so I
want to MAX OUT the support, but my version of Plop won't support this.  I
know the mirror is okay so I am going to send it off to be coated while I
build this new cell.  I would also be interested in looking at designs of
good secondary/spider systems.  Mine work, but are not perfect.  I would
like to also rebuild them.
I have limited machine shop capabilities, so anything machined on a lath or
mill will be beyond my ability. Basically, I have a drill press and hand
tools. Pretty sad, huh.
Clear skies,
Jerry


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