NGC 6946 - The Fireworks Galaxy
This image consists of 70x353.7s exposures with a TPO 16" Ritchey-Chretien at 3250mm with a Canon 6D at iso 400. There is some cropping to trim off alignment issues between the image sets captured over three separate nights, but relatively little. I calibrated with bias, dark, and flat frames, and stacked/processed in Pixinsight.