Here is a narrowband image with H-alpha emissions mapped to red, and OII emissions mapped to both green and blue (HOO palette).
Higher resolution here
**Image:**
* 47x 600s Ha bin2x2
* 50x 600s OIII bin2x2
* 22x 60s Red bin1x1
* 32x 60s Green bin1x1
* 20x 60s Blue bin1x1
Total exposure 17 hours 24 minutes.
**Hardware:**
* Celestron 11" Edge HD
* Celestrong 0.7x EdgeHD focal reducer
* Skywatcher EQ8 Pro mount
* QSI 683-ws8 Camera @ -15°C
* Astronomik 6nm Ha, 6nm OII, Deep Sky RGB filters
* Starlight Xpress Active Optics
* Starlight Xpress Lodestar X2 Autoguider
* Innovations Foresight On Axis Guider
* Starlight Instruments Focus Boss II
**Location:**
* Orange zone in Brisbane, Australia. (Bortle 7)
* Imaged over 10 nights, 0% to 50% moon.
**Software:**
* Planning & camera alignment with Aladin 9
* Captured with AstroArt 6
* Guiding with PHD2 + PHD_Dither
* FocusLock live focusing
* CCDInspector: Image analysis & rejection
* CCDStack 2+: Calibrate, align, stack, combine RGB.
* Photoshop CC: Shadows/highlights, combine Ha+OII+RGB, noise reduction, curves, adjust colour balance, saturation, crop.