Combination of 5, 3 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
NGC 3945 is a moderately large and bright galaxy in Ursa Major. In an 18" telescope it appeared as a moderately bright centre surrounded by a faint, elongated haze. NGC 3978 and NGC 3975 were visible in the same field.