I have some issues regarding my Barlow, perfect for visual but CCD it is causing substantial blue shift which I assume is Chromatic Aberation.
I have tested Registax to re-align final RGB after stacking and has shown some good results but I want to re-align 2000 frames before processing and wondering if anyone knows either some software or easy to define Registax Batch commands that I could re-align the RGB automatically before I process all 2000 frames.
A better idea, probably, is to extract the R, G and B channels from all images, then stack these separately. Once you have these aligned and stacked, combine the 3 images in something like the GIMP or Photoshop. The GIMP lets you do Chromatic Aberration correction with a free plugin - not sure about PhotoShop.
Depending on the type of chromatic aberration (this won't work for lateral CA) you can achieve the same thing by loading R, G and B in 3 separate layers, set them to 'lighten' and just move around red and blue until you're happy (move red into the opposite direction of blue).
