NGC6888 Crescent Nebula in Hydrogen Alpha Light

Click on image to enlarge

Taken on June 4, 2004 from Fremont Peak State Park, San Juan Bautista, California

AP180EDT f/9 imaging scope used (first light for deep sky)

AP80/900mm guide scope

AP1200GTO mount

SBIG ST10XME  imaging camera @-20C

FLI CFW1 Filter wheel

FLI DF2 Digital Focuser

ST7E guide camera @ -15C

Custom Scientific Ha filter 656.3nm/3nm FWHM

Six exposures of 600 seconds (2x2 binned): one hour  total exposure time

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