Here's a wide-field image of the North America Nebula. This was taken with a modified Canon 5D2 and a Canon 200mm f/2.0L stopped down to f/4.0. It is an integration of 24 four-minute exposures. It was calibrated using six dark frames, twenty biases, and twenty flats. All calibration and processing was done in PixInsight.
Thanks for looking,
Very impressive. I've been looking to get that lens myself for this purpose (among others). From your description, I'm guessing it's a pretty dark site?
Current equipment: 5Ds, 5D mark III, 50D, 24-105L, MP-E, 70-200 f/2.8L II, 100L macro, 500L IS II; 1.4xIII + 2x III extenders; 600EX-RT.
Former equipment includes: 300D; EOS-M, EF-M 18-55, Samyang 14mm f/2.8, EF 35 f/2 IS, 70-200L f/4 non-IS, 85L II, Sigma 180 macro, 200L 2.8, 400L 5.6