Thanks Colin, i will check that out. i took some flats with the original gain settings and it seemed to have worked. although i had 5 ours of the antennae galaxies at too high a gain so as to make obtaining flats impossible. the thing that is really frustrating me now is when i stretch the images i have a gradient from top left to bottom right and i cant figure out what is causing it.
i thought it was an artefact of the shutter on the QHY9 when taking 1 second subs but i managed to take 6 second flats and still had the issue.
there may be some sort of internal reflection, either in the telescope or from the observatory. i will try imaging a different part of the sky tonight and see if that solves the issue ...
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