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Hi Dennis,
I've been watching this thread with interest for a while and thinking this mask was a lot of mucking around to make but finally decided to give it a try.
I cut one out of some thick plastic last night - tried it out tonight and works better than I expected. The point of best focus was much easier to find than with the Hartmann mask.
I'll have to make one for the 10" Newt now.
Thanks for the tip.
Peter
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