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11-05-2018, 07:22 PM
RickS
(Rick)
PI cult recruiter
Join Date: Apr 2010
Location: Brisbane
Posts: 10,584
Hi Alex,
Was it an apodizing mask?
http://www.telescope-optics.net/apodizing_mask.htm
http://www.astronomyhints.com/apodize.html
Cheers,
Rick.
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