Strangley, none of the single frames that were stacked have such a pronounced auroral pattern before stacking. My first attempt at M101 a week before was not successful, but I sort of like the result. M 51 with AFS 300mm f/4 E PF f/4.5 on Skytracker, 60 sec exposures ISO 1600, ca 30 usable. I also got another go one the Whirlpool Galaxy the night before, but got only 30 usable 60 sec frames before aurora took over (2x drizzle in DSS). 40 30s exposures used, most of the frame. M 101 buried in aurora with AFS 300mm f/4 E PF f/4.5 on Skytracker, ca. Strangley, none of the single frames that were stacked have such a pronounced auroral pattern before stacking. M 101 with AFS 300mm f/4 E PF f/4.5 on Skytracker, 60s exposures, 110 used. I wonder what the "cloud" in the lower left of the frame is, could it be another galaxy/nebula or is it some kind of flare artifact? I could not find anything like it at that location in Stellarium (best viewed large). Stacked in DSS using 2x drizzle - the image is a little less than half the width of the original frame. Finally I got in >2 hours of imaging time in red zone on M 101 resulting in 110 exposure totaling ca 1 hour 50 minutes of usable frames (60s exposures at ISO 1600, D7100/AFS 300mm f/4 E PF f/4.5 on Skytracker) before aurora took over.
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