[Gimp-user] chromatic aberration

[norman]

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> Are you "copying" the slides, or are you scanning them?
> 
> If you're using a slide copying attachment and effectively rephotographing them onto your digital camera, then the CA of the copying equipment will be a factor. On the other hand, if you're scanning them, then CA isn't usually an issue, because scanning is a different mechanism entirely. If you're scanning and then seeing CA, I believe the CA must be in the original slide. Perhaps you just didn't notice before? We do tend to view digital images at much higher magnifications than we used to view silver halide images. (To be fair, that might not be true of slides though!)

I am copying them using my digital camera but, as every slide I have
copied so far has shown some CA somewhere, I am not convinced that CA
was in the slide. So yes, the culprit must be in the hardware. A point
of interest - when the slide is rephotographed it is in the original
cardboard or plastic holder. The images include a small amount of the
frame which has a beautiful fringe all the way round on the inside
shading from green through to violet.