The pleiades (or Messier 45) is an open star cluster, surrounded by a reflection nebula. Despite the cluster itself, which is really easy to observe in sky without a telescope (sometimes even cities), the nebula solely emerges in photos with a long exposure time.
Telescope: GSO Newtonian
F: f/4
Focal Length: 800mm
Exposure: 75*1 min
Mount: EQ5 SynScan
Autoguiding: None
Camera: Canon EOS 50D modified
ISO: 6400
Filter: Orion SkyGlow Imaging Filter