M42 in [SII], Halpha and [OIII] from AP180EDT f/9 and FLI ML4022 with Custom Scientific Emission Line Filters

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

Taken on September 6, 2009 from my ranch in the California Gold Country under a full moon

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Halpha = Red, [OIII] = Green, Helium II = Blue 

Helium II (468nm) only

Taken on September 6 and 12, 2009 from my ranch in the California Gold Country 

 

why the scopes are behind a corral

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 Halpha filter 

10 x 3 minutes per filter ( [SII], Ha, [OIII])

37 x 3 minutes Helium II

2 hours 51 minutes total exposure 

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