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Stars disappearing in Subs.


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Has anyone had this problem before or know what it's cause would be -

Stars gradually disapper from my subs.

It sounds weird does it not. A couple of samples from last night, both are 2min subs, unprocessed:

2min Sub of M81


1 hour later


I took these images with my 200PDS & the Canon 450D w/ the SW Coma Corrector. One thing I do make sure is that everything in the imaging train is nicely secured tight & on the focuser there is no play. The mount was setup as I normally do, making sure nothing is loose and everything is tight also making sure the ota is well balanced on the mount & polar alignment is accurate as possible.

Any ideas ?



Edited by Deneb
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