Hi everyone,
Thanks for your considered replies, sorry to be getting back to you so late
I've attached a before and after post production image of Omega Centauri that I shot a few night ago. 30x5 min RGB from the SBIG 8300c with the IDAS filter in place. (Yes I just missed the focus, d'oh!)
I process with Nebulosity. The first image is basically out of the stack with levels and sharpening applied. The second has been tweaked, massaged leveled and colour balanced as best I can, minimizing the cyan and enhanceing the yellows stars.
It's never going to match the colour result as shooting under dark skies, but I am concerned about the oversaturation of cyan and desaturation of yellow and orange that result from the IDAS - it seems particularly harsh on yellow stars.
Has no-one else encountered this effect?
Cheers
Andy