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Old 11-01-2011, 10:34 AM
Carl
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Bahtinov mask

Hi There
Can't get intouch with Mike ozstockman (Mike) regarding getting Bahtinov masks made up. Can someone advise me. I have a C8 focal length 2000mm but i image via a 6.3 focal reducer that make my scopes focal length 1200mm.

There is a site where you configure your own mask and download the template http://astrojargon.net/MaskGen.aspx?...ookieSupport=1
but david is not replying at the moment.

Do i configure my mask to suite 1200mm or 2000mm focal length?

Cheers Carl
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  #2  
Old 11-01-2011, 10:51 PM
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mithrandir (Andrew)
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I got mine cut for f/10. It still works at f/6.3
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Old 12-01-2011, 10:25 AM
pjphilli (Peter)
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Hi Carl
I have sized and cut out on stiff cardboard the attached Bahnitov mask.
I was previously using one that had much coarser cutouts but I find that the new one with finer cutouts seems to improve the sharpness of the Bahnitov star image. I made ones for both my 200mm RC f8 and 80mm f6 refractor and they work fine on both.
Cheers Peter
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