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Thanks all. I purposely offset the mount alignment by moving it slightly in both RA and DEC. I then established that a three minute exposure was good for drift and rotation. A ten mininute exposure showed slight rotation and slight drift. Even though autoguided. This then has the effect that all exposures are slightly offset and when median stacked the residual noise (even after in cam noise reduction) the 'holes' simply dissapear. The in camera noise reduction helps as while the 'dark' frame is being taken the camera sensor is moving to a 'new' slightly offset position.
I am looking forward to houghy's camera with tHe lens. Saves me doing the experiment!
No one image is final. All are a mere reflection of reality. The more of us that image the closer we come to this relisation. All images are equally valid.
We should all just enjoy what we can achieve and just try to do better.
Bert
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