The California Nebula (NGC 1499) is an emission nebula located in the constellation Perseus.
It is so named because it appears to resemble the outline of the US State of California on long exposure photographs.
It is almost 2.5° long on the sky and, because of its very low surface brightness,
it is extremely difficult to observe visually.
It can be observed with a H-Beta filter (isolates the H-Beta line at 486 nm) in a rich-field telescope under dark skies.
It lies at a distance of about 1,000 light years from Earth (WIKI)

Imaged with Boren-Simon 6" F/2.8 BABY travel POWERNEWT Astrograph.
SBIG ST8300M camera with FW5 filterwheel and BAADER HA-S2-O3 filters.

HA = 75 minutes
S2 = 50 minutes (BIN 2x2)
O3 = 40 minutes (BIN 2x2)
Total of 2:45 HRS

Imaged from my home in Gan-Yavne ISRAEL
Under nearly full moon.