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Reflection nebulae NGC 6726, 6727, and emission/reflection nebula NGC 6729 in Corona Australis, with the globular cluster NGC 6723 at lower right.  15th magnitude galaxy PGC 62667 is just visible lower centre left.


Image info

Telescope:  Orion 80ED apochromatic refractor at f/7.5

Focus:  Prime focus

Filters:  Astronomik Type 2 L,R,G,B.

Mount:  Vixen GPD with Skysensor2000

Camera:  Artemis 285 CCD camera

Guiding:  700mm refractor guidescope, SAC7 camera, autoguided with Guidedog software

Exposure:  Total 93 mins (31 x 180s) L, 30, 12, 33 mins R,G,B.

Date:  17th July 2006

Processing:  For all frames, offset and flat fielding, registering and stacking done in IRIS.  No dark frames.  RGB combination is first done in IRIS, and star colours are calibrated with a G2V star.  LRGB compositing, curve stretching,  Levels, Smart Sharpen in Photoshop CS2. 

LRGB compositing and colour saturation enhancement through Luminance Layering.





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