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Double image in out-of-focus background with 85mm/f1.2L II USM confirmed

In my 31 July entry, I reported a double-image with the Canon EF 85mm/f1.2L II USM about 60% away from the optical center. I have confirmed that this phenomenon exists with another brand-new sample of the lens, so presumably it is due to the lens design, and not peculiar to any particular sample of the lens. Focusing accuracy (using a custom target with “depth”) on both lenses shows an error of about 5 millimeters (front/back).

Canon EF 85mm/1.2L II USM on Canon EOS 1Ds Mark II
f1.2, 1/160 sec, mirror lockup, ISO 50
65mm behind plane of focus
80% of the way from center to right edge
Lens Sample 1
Lens Sample 2

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