NGC 1499
NGC 1499, commonly called the California Nebula, is a vast cloud of glowing hydrogen and is the classic example of an emission nebula. It is very large spanning 2.5 degrees of sky but it's surface brightness is so low that it cannot be seen by the naked eye unless viewing conditions are ideal.
This image is a 4 panel mosaic and was taken with a hydrogen alpha filter.
OTA: AT65EDQ
Camera: Atik 460ex w/EFW2
Filters: Astrodon Ha
Mount: CGEM DX
Exposure: 10h
Data obtained: December 2013