Great Ridge in NGC7000 taken in [SII], Ha and [OIII] Light

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Location of Great Rift

[SII], Ha, [OIII] = R G B

Taken on July 5, 2004 from my backyard in Castro Valley, California

AP180EDT f/9 imaging scope used at F=1215 (f/6.75)

AP 0.75x photo/visual telecompressor

AP80/900mm guide scope

AP1200GTO mount

SBIG ST10XME  imaging camera @-26C

FLI CFW1 Filter wheel

FLI DF2 Digital Focuser

ST7E guide camera @ -22C

Custom Scientific Narrowband Emission Line Filter

   Sulfur II                        673.4nm  3nm FWHM

   Hydrogen alpha        656.3nm  3nm FWHM 

   Oxygen III                    500.7nm  3nm FWHM 

Four exposures of 600 seconds for Ha and [SII] filters, five exposures of 600 seconds for [OIII]

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