NGC 2237 (Rosette Nebula) in 6 colors S II  Ha  O III  + RGB    60 60 60 + 30 30 30 min, ASA N12 Astrograph,DDM85 Mount,SBIG STL 11000 M Camera The base of this image are the S II, Ha and O III exposures respectively mapped as deep red, red and cyan using Tone Mapping method in Photoshop. An RGB image is overlayed to reduce the contrast in the nebula and to improve the stars' colors.