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Nice work and interesting presentation Stephen.
FWIW, I had similar astigmatism in one of my systems. Marc advised that I redo the secondary and sure enough, the silicone mounting was pulling the mirror out of shape. Tried lots of alternative mounting, but the best has been 3 tabs of white, slightly spongy, double sided tape (Mitre10 home brand, but there are others).
Last edited by Shiraz; 09-08-2014 at 12:46 PM.
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