Wide-field of M42, the Orion Nebula--and it's amazing how cloudy and dusty the whole area is. I spent half the night adjusting things--focus distance, off-axis guider spacing, but managed to capture M42 and the surrounding region (two sets of subs: 21 x 300 second, and 20 x 20 second for the bright Nebula core and Trapezium). Calibration frames: 20 Dark and 20 Bias, No flat frames. I shot these with the ZWO ASI1600MM-Pro monochrome camera, Astronomik 12nm Ha filter, William Optics ZS61 APO, iOptron CEM25P mount.
I also managed to capture a dozen frames of the California Nebula: