NGC 2403, at 50,000 light years across, is about half the size of our own Milky Way galaxy. It is a fairly typical spiral galaxy and has had several visible super nova events.
LUM = 20x10min
R = 23x10min
G = 33x10min
B = 21x10min
Total = 16hrs 10min
L = 47x10min
RGB = 3x10min each
RGB = 52x3min each
Total = 17hrs 20min
This image was captured in 1 night with my Side By Side refractor setup.
SV152 Refractor @ f/6 Riccardi 0.75x Reducer Starlight Xpress Trius SX694
Atik EFW2 Filter Wheel Astrodon RGB/Ha Filters Losmandy G11 Gemini 2
R=24x10min G=22x10min B=24x10min Ha=12x20min Total = 15hrs 40min
This image took almost 3 months to complete due to the constant winter clouds. Most of the exposures were taken under less than ideal skies. Processed with PixInsight