One theory is that the blue from the tie was reflected back in something white (front of softbox, white reflector, etc) and that the magenta is from a reflection also (there appears to be magenta in the shirt). Also I've seen lots of mentions on the web about "chromatic aberration and purple fringing" with the S5. I can just barely see the magenta, however. But the blue splotch is pretty obvious and annoying.
Cheers,
rfs
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