On the left is a single frame at ISO 12,800; on the right is the result of stacking six of these frames, processing to remove CA and adjusting levels. The California nebula is a magnitude 6 object, which basically means you can't see it... too dim. Canon EOS 50D, Hooded Canon EF 85 mm ƒ/1.8 USM prime @ /1.8, ISO 12800, 4 sec. exposure X six, standard tripod. Conversion from RAW to JPEG in Aperture. Stacking and post-processing in WinImages.
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