Thread: A focus mask primer
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Old 01-01-2019, 07:57 PM
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RickS (Rick)
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Join Date: Apr 2010
Location: Brisbane
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Here's a shootout between a Bahtinov mask and two different versions that Ash 3D printed. 2 second subs with a 3nm Ha filter, Borg 55FL f/3.6 scope and ASI1600mm Pro camera.
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