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 This Sc
            spiral is often overlooked by many well known astrophotographers
            because of its high declination, lack of bright guidestars, and
            low surface brightness. However, careful deep exposures are very
            rewarding, and can reveal a wealth of details. NGC2403 is 8.9
            magnitude, and 22 x 12 arcminutes inside, filling nearly half
            of this .5 degree field. Only one 17 magnitude anonymous galaxy
            is seen just above the center, the field is mostly devoid of
            brighter background galaxies.

            
This is a very
            carefully G2V calibrated color image. The luminous straw colored
            core surrounded by delicate blue arms is as accurate as I can
            portray them in a color sense. Witness also the beautiful pink
            HII regions, a combined mix of the two main Hydrogen lines, Ha
            and Hb, which are crimson red and electric arc blue respectively.

            
Seeing has not
            yet returned to normal levels of about 2 - 4 arcseconds, and
            was a bit rough for this image at 4.8 arcsec.

Instrument:  12.5" f/5 Home made Newtonian
Platform:  Astrophysics 1200 QMD
CCD Camera:  SBIG ST10XME NABG with Enhanced Cooling
Guider: SBIG ST4
Exposure:  LRGB = 60:20:20:20 (RGB Binned 2x2)
RGB Combine Ratio:  1: 1: 1.1
Filters:  AstroDon RGB Tricolor
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing FWHM = 4.8 arcsec (Maxim DL - 10min subframe), Transparency 7/10
Outside Temperature:  10 C
CCD Temperature:  -20 C
Processing Tools:  Maxim DL,  Photoshop CS, PixInsight, RW Debloomer.
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