Quote:
Originally Posted by Peter Ward
Not sure what marked benches you looked at.  ....but the area surrounding the keyhole is not blue. Did you flat-field for each filter?
You might want to work on the focus as well..not quite nailed as brighter stars in your rendition have double diffraction spikes and dimmer ones at the edges look like little doughnuts instead of points.
The Eta Carina nebula is a remarkable and popular target. If you look up images of it by Malin or even Wiki you'll get good appreciation of the colour.  |
There is always my porta-potty version :
https://www.astrobin.com/full/333426/B/
