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Focus accuracy

In most usage I found focus to be accurate.

However, I observed focus error under low-light conditions, and even under some conditions where it should not have been an issue. Below, the goose should be in focus, but it is obvious that the lens focused about 18" (1/2 meter) in front of the goose. I had placed the focusing spot right on the body of the goose.

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front focus
front focus error
Canon 1Ds Mark III + Sigma 50/1.4 @ f/1.8

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