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Thanks all.
Jo, this comet is coming around for a second pass later this year, same for 2014 E2 Jacques. 2013 A1 Siding Spring will be swinging by also. All 3 will be a bit brighter then.
H, no auto guiding or hardware tracking on the comet. Have to keep the subs short so the comet doesn't trail. Tracking is via software. "Comet Stacking" was selected on Deep Sky Stacker. It's hard work because the comet on each frame has to be individually selected. There are other programs that do this more automatically that I haven't looked into yet.
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