Hi Paul,
The secret to killing the blue cast, is to load the CLS filter into the camera, snap on a lens (or use the telescope) and take a picture of a white piece of paper in the sun (no shadows on it) and then set the custom white balance of the camera to that shot.
When taking photos using the CLS filter through the scope, the custom white balance (which is of course, blue) will be used to remove the blue cast on astro photos, leaving you with correct colours, that you don't have to process out.
Give it a go, I had the CLS filter installed permanently on my Canon 1000D and never had a blue cast problem once the CWB was set and stored in the camera.
Nice image of M83, btw.
Cheers
Chris
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