M81, M82 and NGC 3077 in UMa

Photographer
Dr Alan Potts
Email
pott_sa@tiscali.co.uk
Location of photo
Newport, South Wales, UK
Date/Time of photo
Mid-exposure 6:00 UT on 7th February, 2018
Equipment
300mm f/4.5 Nikkor lens on Nikon D3300 DSLR at 6400 ISO. Static tripod.
Description
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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