Bahtinov Mask

Recently made a Bahtinov mask for my 5" refractor but haven't tried it yet. Patterned it after posted images and made from heavy poster board. Not sure about the preciseness of the configuration, but suspect that it isn't that critical.

Jud

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It looks plenty good! I've made four so far, three for me and one for a buddy. The design is forgiving. I've tried Hartmann masks and have a Stiletto, and the Bahtinov mask beats 'em both. It is easy to use, and is very sensitive to small changes in the focus position.. A while back I posted a question here about the physics behind the recommended width of the spaces, but didn't get any response. When you get a chance to try it, let us know what you think.

Steve