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6 - 10 min. exposures with the Canon T4i/650D (unmodified).
Telescope configuration: Celestron EdgeHD 1400 with the Celestron 0.7x focal reducer (fl=2737, f/7.7), unbinned, yielding an image scale of 0.32 arc-seconds/pixel. Focused using an AstroZap Bahtinov focus mask.
Camera: Canon T4i/650D unmodified DSLR, ambient temperature 54F and no filter.
Image capture using ImagesPlus Camera Control 5.0
Mount: Software Bisque Paramount MX, with PEC and ProTrack enabled. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software.
Post processing: Calibration, alignment, stacking in ImagesPlus 5.0 using 5 dark frames, no bias frames and no flat frames; DDP in ImagesPlus 5.0. One pass of unsharp mask and resized to 50% in ThumbsPlus.
20141126_M33_CombExcAvg-IPddp-IPadj-TPadj.jpg
All images copyright William J. Shaheen, unless otherwise noted. Do not use or distribute without prior consent.