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Originally Posted by avandonk
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Yes I have followed that thread. Am I to assume that you are using the stablising rig and did so for this image? If so I would have thought the whole train would be stiff so that only leaves one option to narrow down the flexure. It must be coming from the guide scope or the connections of both scopes to each other or both.
However, to make things clear I would suggest you do the same area again but at 15 minutes. If the stars grow more elongated then you can be assured that the flex is related to either the connection of the scopes or the actual guide scope. I know you have been using a micrometer but try this to satisfy your own curiosity. After all we only want to see you succeed and produce great images.
For a deep image of one of these targets I point you toward martin Pugh's image of
NGC6357 That is a deep image showing dim detail and with no noise.
I suggest you should be imaging at -45 or -45C with that camera, doing that with longer subs on these sort of targets and dark subtracting will produce little if any noise. I would think that subs of 20 minutes should produce the sort of results you are trying to achieve. My recent image was done with 10 minute subs and lacks sufficient signal to stretch the image too far. The bottom line is to over come the background noise with the strength of signal. With your bandwidth perhaps even 40 minutes would be better. You would only need 16 subs though in that instance.
Anyway good luck with that. Without narrowing down the causes of flexure in your system it is all moot anyway. I have been through all this and know how frustrating it is to control this issue. Perhaps this camera is just too big for this optical assembly?
