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Camera Comparison Before/After Modification: Crop from NGC7000













  Object Cropped section from images of The North America Nebula (NGC7000), in Cygnus
  Telescope (Photo) Celestron 8" SCT OTA @ f/10 on Losmandy G11 Mount
  Telescope (Guiding) Meade ETX 90mm OTA @f/13.8 on Losmandy G11 Mount
  Camera (Photo) Canon 50D DSLR, before (top)and after (bottom) image sensor filter modification
  Camera (Guiding) Meade DSI Pro III w/PHD Guiding
  Exposure Detail Before:  excluded-average combination of 18 images
After:  excluded-average combination of 17 images
Both:  sub-images exposed at 300 seconds each, ISO3200;  RAW file conversion, full calibration (flat, dark, bias, and flat-dark), and initial image processing using ImagesPlus 3.80; final image processing using Photoshop CS3
  Location Cincinnati Astronomical Society's Dark-Sky Site (Adams County, Ohio) (N38.876, W83.464)
  Date Before:  08/15/09
After:  09/11/09
  Comments These images in this sequence were taken through the same optics and mechanics prior to and after modification of the camera.  The modification consisted of removing the factory filter in front of the image sensor and replacing it with a custom filter for improved red sensitivity.  Both images were processed identically (the "after" image required color-balancing first) and are cropped from larger images of NGC7000.