The Grus-Quartet consists of four large spiral galaxies which are so close to each other that they are interacting.
**Image:**
* 75x 450s Luminance bin2x2
* 18x 450s Red bin2x2
* 18x 450s Green bin2x2
* 18x 450s Blue bin2x2
Total exposure 16 hours 8 minutes.
**Hardware:**
* Skywatcher Black Diamond ED120
* SkyWatcher EQ8 Pro Mount
* QSI 683-ws8 Camera @ -15°C
* Astronomik Typ2 LRGB filters
* 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 3 nights, new 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, deconvolution, remove gradients, combine RGB.
* Photoshop CC: Shadows/highlights, combine L+RGB, noise reduction, curves, adjust colour balance, saturation, crop.
Higher resolution here:
http://adam.lundie.com.au/astrophoto..._20170820.html