Bernard, Great shot. Regarding saturation and well depth, it seems inevitable to me that bright stars will expose a group of adjacent pixels to their full output value. That is, pixels that aren't supposed to get any light at all are often saturated. A really severe case is 2nd magnitude Alnitak in shots of the flame nebula. I found that 6th magnitude stars in the Rosette nebula (12-MON for instance) saturated a disk 15 pixels in diameter in a 5 minute exposure at f/3.6. This says to me that either a lot of stray light is hitting the adjacent pixels, or light is being scattered within the silicon, similar to halation in film. Trying to fix this in processing is challenging because saturation is a non-linear process, not amenable to deconvolution. It will be great to hear your findings on the subject. Paul Lind ----- Original Message ----- From: "Bernard Miller" <bgmiller011@xxxxxxx> To: az-observing@xxxxxxxxxxxxx Sent: Saturday, December 29, 2012 12:38:34 PM Subject: [AZ-Observing] NGC2264 (The Cone Nebula) Hi, The link below is to NGC2264, also known as the Cone Nebula. This image is part of the larger Christmas Tree cluster and also includes the Fox Fur Nebula. This image is a real challenge for my ST8300. The only drawback to the ST8300 is the small full well capacity. Because of this, bright stars can get very over-saturated. Keeping them under control is real processing challenge. I hope you like it and comments and suggestions are welcomed. http://www.azstarman.net/NGC2264.htm Thanks, Bernard -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.