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Strgazr27
Vendor - Deep Space Mods and Composites
Reged: 10/04/04
Posts: 6984
Loc: StonyHill Observatory
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Re: A new focussing mask
03/27/09 02:19 PM
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George,
Very nice. I have to say though that this offers up the same problem I had when I used the common "2 String" crossed diffraction mask. As very small movements in focus can be seen it is still a judgement call as to when both spikes are symmetrical. When I switched to the Bahtinov my images were substantially improved as I found it much easier to decipher the split of perfect focus. I have tried the B. Mask by eye and than run several V curves with FocusMax and found it to be redicuously accurate. I will give your mask a try though.
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Bobby
StonyHill Observatory
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AT 130 F/6 Prototype
Royce 10" f/4 Astrograph (Under Construction)
Self Modded 40D
70-200 F2.8 L IS
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