NGC7293 Helix Nebula in Ha and [OIII] Light

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Taken on July 16, 2005 from my backyard in Castro Valley, California

AP180EDT f/9 imaging scope used at f/6.75

AP 0.75x Telecompressor

FLI IMG6303E imaging camera @ -35C

AP80/900mm guidescope

SBIG ST7E guide camera

FLI CFW7 color filter wheel

3nm FWHM Custom Scientific Ha 50mm AR-Coated filter

3nm FWHM Custom Scientific [OIII] 50mm AR-Coated filter

3 exposures of 20 minutes through Ha and [OIII] filters

2 hours total exposure time

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