Differential Color Focus With Zeiss 35mm f/1.4 Distagon

Ad-hoc shots sometimes turn up interesting stuff that explains a mystery.

Just posted in my Guide to Zeiss ZF / ZE lenses is a new page showing the differential color focus with the Zeiss 35mm f/1.4 Distagon. My tentative diagnosis is spherochromaticism, and it explains why the 35/1.4 Distagon can be such a challenge to focus wide open.

Cracks and Rings
Canon 5D Mark II + Zeiss ZE 35mm f/1.4 Distagon