Here is an unexciting test shot of some ducks in a river, taken in bright sunlight:
In the foreground, the highlights have a distinctly pink cast. I am certain they weren't pinkish in reality, since it's a reflection of the sun. The white balance was set automatically by the camera and appears to be correct. (It's almost identical to Lightroom's 'daylight' white balance preset.)
Additionally, in the following picture (which is slightly out of focus) the highlights appeared greenish:
I suspect it has to do with chromatic aberration, since they seem to come out greenish when the focal plane is in front of the water and pinkish when it's behind it. However, checking the "remove chromatic aberration" box in Lightroom doesn't seem to have any effect on these images.
I haven't observed this in my shots before, but is it a common thing to happen? I just bought this lens second-hand and I can return it this week if there is a problem with it, so I'd like to know if that's the case.
On the other hand, if this is normal and expected, what should I do to avoid this result in future?
If it makes a difference, these images are rendered from RAW files using Lightroom, with all the settings left at their defaults. They were shot wide open, at f/2.4, which I realise was unnecessary in this situation. The lens is a Pentax 70mm limited prime.