Veil OIII/H-a Nebula Enlarge Description Published in Sky and Telescope, October, 2005, page 122. Published in Astronomy, January, 2006, page 118. 6 nm Astrodon H-a, OIII. OIII mapped as teal. H-a mapped as red in clipped layer masks H-a image: Image Date: 06/11/2005Details: Exposure Time: 3 hrs Total; 1.5 hrs H-a, 1.5 hrs OIIICamera: SBIG STL11000Telescope: RC Optical Carbon Truss 12.5 inch f/9 Ritchey-ChretienMount: Software Bisque Paramount ME