NGC 2237 et al (Rosette Nebula)

2x1 mosaic of H-alpha (red) and O-3 (green & blue) exposures. About 4 hours for each half. I hope to add some RGB data in the future.

AT111EDT with WO Flat 4 reducer/flattener
AP Mach1 mount
QSI 583ws camera with Astronomik filters