Barnard 312 - dark nebula https://www.flickr.com/photos/maartenvlh/53136536628/in/pool-11947580@N00
Maarten VLH has added a photo to the pool:
Barnard 312 is a dark nebula in constellation Scutum.
These dark nebula were discovered by E. E. Barnard from Mount Wilson in 1905, using photographic emulsions on the 10 and 61 inch refractors.
Color image taken at the remote observatory from the E-Eye site in Spain. The image is composed of 25 hours of exposure time with the ZWO ASI-2600MC color camera using a Takahashi CCA250 f3.6 astrograph, riding a unguided 10Micron GM2000.