NGC6888 Crescent Nebula in various combinations of [SII], [NII], Halpha and [OIII] filters from AP180EDT f/9 and FLI Microline ML4022 camera with Custom Scientific 3nm FWHM AR-coated 50 mm round filters

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[SII] + [NII] + Ha = Red, [OIII] = Green, [OIII] + 0.3 * Ha = Blue

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[SII] = Red, Ha = Green, [OIII] = Blue

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[NII] = Red, Halpha = Green, [OIII] = Blue

Taken on August 15, 2009 from my ranch in the California Gold Country

AP180EDT f/9

FLI Microline ML4022 imaging camera operated at -25C

AP 1200 GTO mount

AP80/900mm guide scope with adjustable rings

SBIG ST7E guide camera

Custom Scientific 3nm FWHM AR-coated 50mm round filters in 

[SII] = 673 nm, [NII] = 658.4 nm, Ha = 656.4 nm, [OIII] = 500.7 nm

3 x 15 minutes per filter binned 2x2

3 hours total exposure for all four filters

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