The Pleiades (M45)
This is two hours and four minutes of 30 second exposures captured with a Canon T2i through a Stellarvue 90mm refractor. The telescope was mounted on an HEQ5pro, but the images were captured without guiding. Dark and bias calibration frames were used, but I was absent minded and forgot to capture flats for the image.
Processing and stacking were accomplished with Pixinsight.