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35/1.4 Distagon Longitudinal Chromatic Aberration (LOCA)
I came across this intriguing example while taking some ad-hoc shots. It helps explain the difficulty in focusing at f/1.4, either in Live View mode, or by eye, at least under some conditions.
According to Zeiss optical experts:
All fast 35mm f/1.4 lenses have some amount of differential color focus, mainly caused by longitudinal (axial) chromatic aberration. The rangefinder lenses are better than the SLR-types.
The deviation of the green-blue is larger in the Distagon than the red-green, due to the common trading of various design features. In some spectral conditions this might cause a blue colour casting over fine details in the neighborhood of brightness.
On the other hand the red-green channel MTF of the Distagon is much higher than in others. So the comparison will always depend on the subject colors.
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