A very dim and diffuse emission nebula Sh2-155 is commonly referred to as the Cave Nebula. To help overcome the dimness this image was taken through narrowband filters which bring out the
ionized hydrogen, oxygen and sulfur.
OTA: William Optics Star71
Camera: Atik 460ex w/EFW2 filter wheel
Filters: Astrodon Ha/OIII/SII (3nm) LRGB
Mount: AP Mach1
Exposure: Ha:OIII:SII:L:R:G:B 400:120:120:48:48:48:48 (m) rgb bin 2x2
Data obtained: August - November 2015