Deep-Sky Imaging True colour image of the Veil nebula region in Cygnus April 21, 2011 Greg Leave a comment A 2-frame Sky90/M25C one-shot colour camera image of the Veil nebula in Cygnus. The reducer/corrector on the Sky 90 gives a very flat field, a focal length of 405mm and a reasonably fast f# of 4.5 Share: