First time shooting this wonderful sight. Scope is a Williams Optics FLT110 with Canon 400d unmod. 6 x 7 Min lights, 6 x 7 Min darks ISO 800 PHD guided.
I have found that I am also getting what looks like round circles almost like water marks on my images and this is the same through three different scopes. I think I might have something on my chip. Any ideas?
Another nice image of this cluster of Galaxies.
The spots look a lot like dust either on your CCD or in the imaging train somewhere. Taking Flat field shots and applying them to the images before stacking should remove this problem. Then your next problem is to find them and clean the blighters off.
