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Taken on July 14, 15, 15, 21 and 22, 2004 from my backyard in Castro Valley, California and on July 16 & 23 from Fremont Peak State Park, near San Juan Bautista, Ca.
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 and -20C
FLI CFW1 Filter wheel
FLI DF2 Digital Focuser
ST7E guide camera @ -22C
Custom Scientific Narrowband Emission Line Filters
[Sulfur II] 672.4nm 3nm FWHM
Hydrogen alpha 656.3nm 3nm FWHM
[Oxygen III] 500.7nm 3nm FWHM
12 exposures of 600 seconds for Ha
20 exposures of 600 seconds for [SII]
23 exposures of 600 seconds for [OIII]
Total exposure time = 9 hours 10 minutes