Sh 2-155 Cave Nebula

C9 Cave nebula

-Telescope: William Optics FLT 110 with F/T focuser 3025 & Starizona usb motor focus
-Mount: Skywatcher ΗEQ5 pro
-Chip: Atik 314L+ at 0c
-Guiding: TS finder 8x50 with Meade DSI I pro
-Filter wheel: Starlight Xpress usb 7x1.25
-Location: Salamina (08.2013)(Ha) & Loutsa,Evia (LRGB)
-Luminance: 18x420sec 1x1bin
-Red: 10x300sec 1x1bin
-Green: 10x300sec 1x1bin
-Blue: 10x360sec 1x1bin
-Ha Astrodon 5nm :26x600sec
-Total: 546 minutes
-Programs I have used-
Maxim DL ,Pixinsight 1.6, Photoshop CS5, The Sky6 ,Focusmax

The Cave Nebula, Sh2-155 or Caldwell 9, is a dim and very diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is located in the constellation Cepheus.
Visually it is a difficult object, but with adequate exposure, makes a striking image. The nebula gets its name from the dark lane at the eastern side abutting the brightest curve of emission nebulosity which gives the appearance of a deep cave when seen through a telescope visually.