Click image to enlarge, click here for highest resolution
[SII] + [NII] + Ha = Red, [OIII] = Green, [OIII] + 0.3 * Ha = Blue
Click image to enlarge, click here for highest resolution
[SII] = Red, Ha = Green, [OIII] = Blue
Click image to enlarge, click here for highest resolution
[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