Thanks guys, i was really happy with the detail i got in this one.
i still dont think the top left part of the frame is from vignetting or the lack of flats (even though thats still a big problem) i think its more to do with the way the dark is being applied.
that entire corner is filled with amp glow in my subs and when the dark subtracts it, it seems to subtract the data with it causing it to clip before the rest of the image.
Leon: this thing doesn't have INCR or AV mode mate
i'm going to shoot some more darks in a minute and try calibration again, ill also try to get some flats somehow, even if they aren't 100% they should be better than nothing.