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Let me know how it performed. I recall using a Bahtinov mask calculator to arrive at the width of the obstructions and since found that 4 -5mm is OK, with the mask just in front of the objective and open the lens wide to avoid IRIS spikes. No need to refocus if stopping down - with the 200mm.
Last edited by rcheshire; 03-05-2014 at 09:25 PM.
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