NGC7635 Bubble Nebula in LRGB from 18" Cassegrain

click on image to enlarge

shot on November 15, 16 and 17, 2004 from my backyard in Castro Valley, Ca. 

Compact Collapsible Cassegrain 18" @f/12.60 (F=5760mm)

IMG6303E camera @-35C

AO7 @ 16 Hz

RCOS Dichroic beam splitter

ST7E guide camera

FLI CFW1 Filter wheel

Optec  RGB filters

11 exposures of 5 minutes  + 3 exposures of 10 minutes through Optec Red Filter (binned 2x2) used for Luminance

12 exposures of 5 minutes through Optec Red Filter (binned 2x2) used for Red Channel

12 exposures of 5 minutes through Optec Green Filter (binned 2x2) used for Green Channel

12 exposures of 5 minutes through Optec Blue Filter (binned 2x2) used for Blue Channel

Four hours 25 minutes total exposure time

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