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It looks like it to me .
Its easier to see if doing flat fields , little blotches everywhere ,also as you take exposures when the camera is warmer +0 ( flats ) everything looks fine and as the camera cools the problem starts.
Took me ages to work out this problem because Sbig think you should be able to see the fog on the CCD , I sure can't and they don't have a pic of how the images look with the problem.
Some people ( like me ) recharge every 6 months.
Zane
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