Patrick Holland
patrick@pcalliance.biz

6/6/2010 12:23:14 AM
The Lagoon Nebula, taken 5-22-10 at approximately 1:30AM. The original run was 100-40 second subs. My initial processing revealed some problems of both symmetry and color. I thought the problems may have been related to a new spacing technique I was using between the Meade .63 FR and the camera chip. After talking to John, I began a painstaking process of processing all of my subs and manually eliminating 47 of the original 100. I then had Images Plus re-process the remaining subs and darks. This picture was the result. There is missing nebulosity but the core nebulosity revealed some beautiful detail...
Meade 10" LX200ACF in ALT-AZ
Canon XSi Rebel (Hap Modded) w/Meade .63X Focal Reducer at 55mm distance from FR to Chip. (No apparent vignetting)
53-40 Second Light Subs/20 Darks
Processed in Images Plus 3.8


Comments about this picture from visitors:
Well done Patrick! Sometimes you have to pick through the garbage to find the treasure. Jim
Thank you Jim! John was right on when he said to process the individual subs to find the problem, I did this and found weird problems with about 20 subs and the others were thrown out due to trailing. I am beginning to hit my limit on ALT-AZ exposures. With the FR spaced at 55mm, I was at about F7.9, in which 40 second exposures are not enough on most DSOs and I am getting a bit of Field Rotation. The solution is to setup the wedge and get polar aligned.
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