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Good stuff Ken! A Thorlabs 300 l/mm 50mm sq grating is not much more expensive than the SA100 grating and might be the way to go when my SA100 finally succumbs to years of use and mis-treatment! Less vignetting when used over a camera lens than the SA100 (25mm diameter) for a start. Thanks Terry for the tip about masking too (also to Ken, must have missed it in the book!).
Cheers -
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