This was probably the 3rd ever object I tried to image, all of about 2 months ago. Looking back on it, the data I got was OK, but the calibration frames required to produce a decent end result were lacking. This image also shows poor collimation ("brightness" (bad calibration / CCD) is not centred), vignetting, lack of dark frames to remove the amp glow in the top left corner, the list goes on. I only wish I knew then what I know now... but that is the nature of astrophotography. Steep learning curve, and will do better next time. Main lesson: choose object carefully, ensure telescope is collimated proplerly, and get calibration frames right, and lots of them!
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