Combination of 20, 3 minute exposures using H-alpha and Sulphur II filters,
and 10, 3 minute exposures using an Oxygen III filter.
SBIG ST-8XE CCD. 300mm f/6 newtonian telescope at prime focus.
NGC 1923 is a large and bright emission nebula with an embedded open star cluster, that belongs to the Large Magellanic Cloud. It is easily visible in an 8" telescope.