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RGB= Ha, [OIII], [SII]
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Ha + [OIII] + [SII] = Greyscale
Taken on May 29, 2004 in my backyard in Castro Valley, Ca.
AP180EDT f/9 imaging scope used at F=1620 (f/9) (first light for deep sky)
AP80/900mm guide scope
AP1200GTO mount
FLI IMG1024S imaging camera @-35C
FLI CFW1 Filter wheel
FLI DF2 Digital Focuser
ST7E guide camera @ -15C
Custom Scientific [SII] filter 673.4nm/ 3nm FWHM
Custom Scientific [OIII] filter 500.7nm/3nm FWHM
Custom Scientific Ha filter 656.3nm/3nm FWHM
Five exposures of 600 seconds for Ha and [OIII]
Four exposures of 600 seconds for [SII]
Total exposure time 2 hours 20 minutes