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Bahnitov mask image showing a star that's almost in focus. Chris Rowland.

Bahnitov mask image showing a star that's almost in focus.
Chris Rowland.

Description : The central line in the star pattern moves as the focus changes, for perfect focus it should be exactly between the two diagonal lines.
Oynx 80mm scope, 1 sec, section of full size image with EOS400D
From: Wycombe Astronomical Society Members (Wed 01 Oct 2008 06:21:04 AM CDT)
Is this like using a Hartmann mask? I have never heard of a Bahnitov mask. What is the star that you have focussed on?

Jan

Jan
From: Wycombe Astronomical Society Members (Wed 01 Oct 2008 11:49:43 AM CDT)
Yes, it's like a Hartmann mask but more complex to make. I'll bring one along on Thursday. You focus by getting the central spike between the two angled ones.
Chris

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