AMATEUR ASTRONOMY SITE
Javier Gómez Laina                                                                   Sharpless 2-155  "Cave nebula"  in Cepheus


Object  Sh2-155    "Cave nebula"         -  emission  nebula  -
Telescope Celestron C-8 203mm  f3.0     TeleVue 76 guide telescope & QuickCam.
CCD  Starlight MX716 CCD camera. Astronomik  Ha & RGB filters.
MOSAIC  4  frames           ( 2 width  x  2 height )
Exposures
(each frame)
L
R
G
B
120'  H-alpha   (120 x 60")  5'  (5x60") 6'  (6x60") 10'  (10x60")
Date
22 Sep  -  5   Nov   2004
Processing Flats, Darks & Bias calibration and aligning  in AIPWin. 
Combining in Ray Gralak's Sigma-Clip. 
Deconvolution in AstroArt with Robert Vanderbei's  plug-in. 
Mosaic and RGB combine in Maxim DL (R channel= 80% H-a, 20% R). 
PhotoShop: L (50% opacity) and RGB layers,  gaussian blur and color saturation. 
Final image:  LLLRGB layers.
Noise processing in Pleiades Astrophoto's  PixInsight LE.