My first attempt at a tri colour narrowband image. Hydrogen alpha (ha) is green, Oxygen (OIII) is blue and Sulphur (SII) emission is red. This is taken using my ICX285 chipped camera with a 135mm M42 SLR lens and narrowband filters. I have used 6nm Ha and SII filters and a cheaper 8nm filter for the OIII - I can't afford a narrower OIII filter yet, much as I would like one! I am climbing a steep learning curve with the tri colour processing lark. It is easy to end up with a very green image due to the much stronger Ha signal, so that must be reduced to get a balanced image. I had some problems flattening the OIII data which has lead to a rather lumpy background. I'm sure I'll have another go at processing this image as my experience grows.
Captured in ArtemisCapture, calibrated in ImagetoolsCa, combined in maxim, thuggery in photoshop. Total integration time 27.5 hours
Exposure Details :
Astrodon 6nm Ha 38x900s on 57mm @ F5 with ART285
Astrodon 6nm SII 33x900s on 57mm @ F5 with ART285
Baader 8nm OIII 39x900s on 57mm @ F5 with ART285
Curdridge Observatory, Southampton,UK