The Iris Nebula, NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus.
NGC 7023 is actually a cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158. Nebula apparent magnitude 6.8

LRGB Image taken 2 September 2006 from Lockwood Valley, California

Lum 150 minutes 1x binned, 5 min sub-exposures
RGB 45:45:45 minutes 2x binned, 5 min sub-exposures

Total Exposure Time = 4.75 hours