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I was using the CPL with a Maksutov - I wasn't sure if this was an issue, but the other photo was using a WO DCL-28 eyepiece and a different camera, so most likely the Maksutov is not the problem - but it could have been dust on the optical train somewhere.
The other thing is that some diagonals - the eyepiece holder is a little larger than the eyepiece, so tightening the lock screw pushes the eyepiece to one side or the other - this may be part of my problem. I might have another look at it - now that you have reminded me.
-John
P.S. I also have a WO 2" 52mm FL projection eyepiece - this one is huge and has a very long eye relief - so much that I need to be about an inch above it to view comfortably - but no problem for a DSLR camera.
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