The California Nebula (NGC_1499) is a HII emission region in the constellation Perseus, it was discoverd by E.E. Barnard in 1884 on long exposure plates.
Because of the red color and it’s faintness it is usually only visible in photographs.
I used my unmodified Nikon D7000 camera in combination with the Nikon AF-Nikkor 85mm f/1.8 for this photograph. 11 individual exposures of 120 seconds at f/2.8 were combined using Regim by Andreas Rörig. Additional adjustments were made in Adobe Lightroom.