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Arun Gupta wrote:
While there should be no issue for the 24L v1 & 2, and the 70-200 f/2.8L, L IS, L IS II, pages 79 onward of the 5d3 manual divide lenses into groups A to H.
In group A, all the AF points work, including all the dual cross-type AF points. The lenses above belong to group A.
In group B, all the AF points work, but only the central dual cross-type AF point works as such. This includes the 14L, 15mm f/2.8 fisheye, the 24-70 f/2.8L.
In group C, all the AF points work but none work as dual cross-type AF points...Show more →
While I must confess I'm disappointed to see such a big effect of the lens used on the AF system I'm amused to see the 50/1.8 in group A while the 800/5.6 is in group F and the 1200/5.6 in group G.