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Nice work Peter. The middle star looks the sharpest to me – is the sequence before focus – at focus – through focus or is it just my eyes!
Last night I noticed than when using the mask visually with my C9.25 and Pentax XW14 eyepiece, I could cause the central bar to “move” when I moved my eye around the eyepiece, so it does seem a very sensitive method of focusing.
Cheers
Dennis
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