Very carful color calibrations of the tricolor system on G2 stars yeild this image of a very faint planetary nebula in Ursa Major, which has a blue core, with a red border. I have seen colors for this object with films and CCD ranging the gamut, from blood red, to bright green. Note the deep blue central star which produced the nebula is clearly visible. Four other stars seem to inhabit the confines of this dim object.
Instrument: 12.5" f/5 Home made Newtonian CCD Camera: SBIG237 Exposure: LRGB = 60:20:20:24 (RGB Binned 2x2) Filters: RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing 8/10, Transparency 8/10 Outside Temperature: 35 F CCD Temperature: -20 F Processing: Maxim DL, Photoshop, PW Pro.