NGC6888 Crescent Nebula in Sulfur, Hydrogen and Oxygen from Astro-Physics AP180EDT f/9 and FLI Proline 3200 with Custom Scientific 4.5nm FWHM Emission Line Filters

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Taken on April 25 & 26 and May 1, 2008 from my ranch near Mariposa, Ca.

Astro-Physics AP180EDT f/9 imaging scope used at f/9

Finger Lakes PL3200  imaging camera operated at -45C

Robo-Focus Focuser

Finger Lakes CFW7 Filter wheel

Astro Physics 80/900mm guide scope

SBIG ST7E guide camera

Custom Scientific 4.5nm FWHM Emission Line filters: [SII], Ha and [OIII], 50 mm unmounted

11 exposures of 10 minutes unfiltered for Halpha: 1 hour 50 minutes exposure

19 exposures of 10 minutes unfiltered for [SII]: 3 hours 10 minutes exposure

25 exposures of 10 minutes unfiltered for [OIII]: 4 hours 10 minutes exposure

Total exposure time = 9 hours 10 minutes

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