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8 - 10 min. exposures at -8 deg. C. Gain 69%, Offset 125. TEC-140 (980mm, f/7) with the AP 27TVPH .75x reducer, yielding 760mm, f/5.4; Q285-M monochrome camera, Baader uv/ir filter. No calibration frames (darks, flats, bias). Images aligned using Nebulosity; combined using ImagesPlus.
20080602-abell2151_IPCombAdpAdd.jpg
All images copyright William J. Shaheen, unless otherwise noted. Do not use or distribute without prior consent.