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.
Sharpless 2-16 is a large and faint emission nebula in Sagittarius, very close to the location of the centre of the Milky Way. It was not visible in a 12" telescope.