Processing change: removed dark area artifacts,
residual from stretching color channels and anti-gradient
* * * * * * *
Wide field image of the Markarian Chain of Galaxies in Virgo
Apogee U8300, Astrodon LRGB Gen 2 E series filters
Pentax 6x7 medium format 200mm F.L. lens stopped down to f5.8
R: 4 x 20 minutes
G: 4 x 20 minutes
B: 5 x 20 minutes