[bmitchell82 (Brendan)]

took this a few weeks back after i finally found the astigmatism in the 10" mirror.

http://i700.photobucket.com/albums/w.../m-17-post.png
warning it is a large file.

Ive also added a few extra things that people will find of use, as its not enough to just say ISO 800 for a DSLR as ambient temperature is very important. also for larger scopes wind conditions play a part.

Hope all find this informative and what can be done with a cheap telescope mount combination.

Target: M17 Swan Nebula
Camera: Canon 40d modified, Baader MPCC
Exposure Capture: Maximdl 5
Scope: 254mm modified dobsonian
EFR: f/ 4.72 \ 1200mm
Mount: EQ6 Pro
Exposure Setting: Prime focus, ISO800, RAW
Exposures: 4 x 10 min
Date: 8th of April 2010
Time: 05:42
Temp: ~13 deg start ~8 deg finish
Seeing: 6.5/10,
Wind: >5km/h wind gusts
Guiding: Meade DSI II + Skywatcher Finder
Focus: Nebulosity 2.0 and MaximDL
Stacking: CCD stack
Image adjustments: No flats, Bias or Darks subtracted.
Processing: Adobe Photoshop CS4