Thanks Chuck. I think I actually used 34 frames for the final image; each of 1-minute duration. I had to throw away several frames because clouds were drifting through the field. Here are the processing steps that were used on this image... Stack procedure: - Calibration with dark frames only - Star alignment - Poisson reject algorithm on the image stack to remove strikes, hot/cold pixels, artifacts, etc. - Average combine 34 frames to a single stacked frame Post stacking procedure: - Background modeling to remove gradient - Histogram stretch - Crop edges That's about it. Perhaps the club could offer a basic processing class someday... there seems to be some interest. Cheers, Tyler -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Wednesday, February 20, 2013 6:21 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Test Image from New Astrograph - Adventures in ATM Tyler, that's an incredible image, and especially so for just a "shake-down" test run! How many 1-minute exposures did you stack to create it? Or is it a single frame? What other processing did you do, if any? You set a high standard for guys like me who merely dabble in imaging. Well-done. (pat on the back and hearty handshake!) On Tue, Feb 19, 2013 at 8:39 PM, Tyler Allred <tyler@allred-astro.com>wrote:
Hello All,
I have been working feverishly on my new astrograph and everything is now working well except the flexure issue I mentioned in a previous thread. I finally got a chance to run the scope for about 40 minutes a couple of nights ago, and decided to point it at the Flying Hamburger Galaxy (NGC3628). Due to flexure, I am limited to 1-minute exposures, so this image is not very deep or well defined, but I can see potential. I thought I would post it for others to enjoy. The new scope has over twice the focal length of my previous scopes. This longer focal length, combined with the small pixel size of the ML8300 camera, make for a pretty large image scale. This is going to be fun! :)
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