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Old 30-10-2019, 12:04 PM
Martin Pugh
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Martin Pugh is offline
Join Date: Nov 2006
Location: Canberra, Australia
Posts: 1,317
Thanks for the replies.

I have been reading about a tri-bahtinov mask that is supposedly good as both a focusing and collimation aid. Would be interesting to try. Anyone making them here?

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