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Thanks everyone. As I have just said to Cometcatcher, I'm wondering whether it is stray moonlight entering the back of the camera because I forgot to fit the rubber viewfinder cover. Vignetting would be pronounced in the corners; what I am referring to is a large amorphous patch nudging
the bottom right of the Helix itself. My 80mm refr has vignetting, but I've not had that prob with the Newt.
raymo
Last edited by raymo; 04-09-2014 at 06:23 PM.
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