M 37 is the brightest of the three Messier open clusters in Auriga. The cluster is fairly large and rich, with about 150 stars being crowded into an area smaller than the full moon. It is visible to the naked eye under dark skies, and is a fine object for the telescope.

57 minutes exposure, Kodak Elite Chrome 200 slide film.
5" f/5 refractor at prime focus.

Combination of 3, 190 second images. Modified Canon Digital Rebel DSLR camera.
5" f/5 refractor at prime focus.

Combination of 15, 1 minute images unfiltered and 15 1 minute images using red, green and blue filters.
SBIG ST-9XE CCD. 12" f/10 schmidt-cassegrain with an f/6.3 focal reducer.