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M57 at almost full moon

Started by hakescl, 10/06/2007 11:58PM
Posted 10/06/2007 11:58PM Opening Post
Instead of just admiring everyone else's artwork, I feel like I should at least post something, even if it isn't up to some of the great shots I see here. Here is my latest version on M57, shot during an almost full moon. I was really just testing diferent guide times on the PHDGuiding software, but took a bunch of 1 minute exposures of M57 along the way. I will have to verify, but ~12min L, and ~6 or 8min RGB through a 16" LX200. I definitely threw out a few frames along the way and just adjusted the color so it looked about right. There was much more depthl I could see in the raw frames, but there was an irritating gradient I suspect from the mostly full moon behind me that didn't subtract out with the flat frame. I just made things darker until the sky looked mostly black. I could see at least a half dozen galaxies in the background, so I think I might go back and get some more data that is hopefully flatter. Overall, I am getting happier with the guiding now, and would always appreciate any comments and/or processing hints.

Thanks,
Charlie

Attached Image:

hakescl's attachment for post 39050

Fort Lewis Observatory: (37.238, -108.052) ~2360m (7744 ft.) elevation.
Darkness - typically 6.5+
Scope - Meade 16" LX200; f6.3 focal reducer
Focus - JMI Smart focus
Camera - SBIG ST-10XE; (~.5"/pixel)
Guiding - AO-8 and/or Meade 5"/DSI/PHD
http://www.fortlewis.edu/observatory
Posted 10/07/2007 12:44AM #1
Well, that seems up to par with lots of the other great shots! Very cool!
Posted 10/07/2007 03:22AM #2
An artist is never happy with their work! The pic is awsome to me.
Ken
Posted 10/07/2007 03:27AM #3
That's very good, Charlie, especially given that you shot this during full moon! I rarely attempt LRGB during full moon!

Eric
Posted 10/07/2007 03:36AM #4
Very nicely done Charles, specially under your conditions...
Nice detail (& very bright colors!) 8O

Looking forward to your next shots!
Thanks for sharing! 8)

Ivan Gastaldo 8)
Coconut Creek, FL

Ivan's Observatory
Lat 26N 16' 48" Long 80W 10' 48"
[COLOR="Red"]Personal Website:[/COLOR] http://www.ivangastaldo.com

CCD Imaging and Processing/Deep Sky - Moderator
I like to complain about everything - Moderator
Posted 10/07/2007 04:56PM #5
Charles Hakes said:
...........there was an irritating gradient I suspect from the mostly full moon behind me that didn't subtract out with the flat frame........
A flat won't remove a gradient caused by a full moon or light pollution. Flats remove the effects of vignetting and dust motes.
Ron Wodaski details a procedure on how to remove gradients in his first book.
Even easier is to use Russ Croman's gradient remover program:
http://www.rc-astro.com/resources/GradientXTerminator/index.html

dan kowall