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Hi Rod,
"I think you are confusing spider spikes with the obstruction caused by the secondary itself. " More than likely...
"I think most people use the star test for final figuring and confirmation of bench test results."
Yes, from what I had read that is true, I was hoping for such a shallow mirror to be fairly close after the 1st polish though. I did take the stellafane ronchi file to Office works and got 10 copies, all were fairly rubbish. I will have to try and track down a better printer. I have glass slides as well.
Steve
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