Barnard 37 is a large dark nebula located above the Cone Nebula / Christmas Tree Cluster. This 1.7 x 1.3 degree view depicts just the northwestern portion.
Luminance – 18x600s – 180 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
300 minutes total exposure – 5 hours
Imaged from Dardenne Prairie, Missouri (a red zone - http://www.bigskyastroclub.org/lp_bortle.html) on February 2nd and 8th, 2019 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/46315743444/sizes/l