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Old 25-06-2009, 10:54 AM
bloodhound31
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bloodhound31 is offline
 
Join Date: Aug 2006
Posts: 4,628
Bahtinov mask not working.

I printed a mask off from an online mask generator onto clear projector paper and used it on Jupiter for practice.

As you can see, image 1 is slightly out of focus as the central spike is high.

Image 2 is focused as the spike is centred.

Funny thing is, it works in theory, but when I take the mask off and take an exposure, the stars are not sharp. Why would that be I wonder?

The mask is taped to the very front of the dew shield on the ED120. Photos are very short exposure with the Orion Starshoot Pro

For focusing, I think I will need to stick to the numbers game in MaxIm for now. I get perfect focus every time this way. It takes a bit longer, but at least it's right.

Baz.
Attached Thumbnails
Click for full-size image (Jupiter Bahtinov1 (Medium).jpg)
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