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Just as a small aside the other advantage of this OTA is there are NO diffraction spikes due to the secondary being supported by the corrector plate. After thirty years of collecting x ray diffraction data I do not want to see any unnecessary pollution of my images. You may as well scratch a big cross into your optic surface! I know it is unavoidable with a really big diameter reflector but I do not have to put up with it!
Bert
Nearly lost it there.
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