M81, M82 and NGC 3077 in UMa

Dr Alan Potts
Location of photo
Newport, South Wales, UK
Date/Time of photo
Mid-exposure 6:00 UT on 7th February, 2018
300mm f/4.5 Nikkor lens on Nikon D3300 DSLR at 6400 ISO. Static tripod.
Over 1000 subframes were stacked in DeepSkyStacker for this image. ISO was set to 6400 with 2s subframes with a total exposure of the stack of 36m 04s. The limit of 2s was based on a limit of approximately 0.8s at 0 degrees dec (the allowable value to avoid drift is the celestial equator value divided by cos(dec).
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