Site hosted by Angelfire.com: Build your free website today!

 

 

 

 

 

 

 

 

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.

 

Comments

 

 

 
Copyright 2003 to 2014, by TG Tan.  All rights reserved.  Copyright exists in all original material available on this website.  This material is for your personal individual, nonprofit use only.  Redistribution and/or public reproduction of this material is strictly prohibited without prior express written permission from the author.