Imaging telescopes or lenses: CANON 200 f/2.8
Imaging cameras: Canon EOS 50D
Mounts: Orion SkyView Pro EQ
Guiding telescopes or lenses: Orion Finderscope 9x50
Guiding cameras: Meade DSI
Filters: Astronomik CLS Clip-Filter
Accessories: DIY Thermoelectric cooler
Dates: Jan. 5, 2011
Frames: Astronomik CLS Clip-Filter: 158x240" ISO800 12C
Integration: 10.5 hours
Avg. Moon age: 0.61 days
Avg. Moon phase: 0.42%
Bortle Dark-Sky Scale: 8.00
RA center: 56.572 degrees
DEC center: 24.163 degrees
Pixel scale: 4.965 arcsec/pixel
Orientation: 179.565 degrees
Field radius: 3.167 degrees
10h32m on M45 (240s x 158, iso800, f/4). bortle red/white zone, CLS filter.
thanks to ferran's image [here](http://astrobin.com/8179) i was able to compute a proper background model for this reprocessed image. because of the CLS filter everything is blue to begin with and it would have been impossible to tell where to try to sample the background for gradient removal.
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