Hi. But my particular interest is the constantly repeated claim that Sigmas have dicey autofocus, and that this AF issue may be caused by some kind of communication problem between the Sigma lens and the (Canon, Nikon, etc.) OEM camera.
I would like to see someone compare the hit rate on a Sigma-Canon setup vs. a Sigma-Sigma setup in the same shooting conditions to see if there is any difference. Obviously there would be the factor of the two different bodies and the different AF systems, but it would still be the first time anyone ever tried it and had any data on the subject of whether any AF issue is likely at least in part a result of Sigma having to reverse engineer firmware to the Canon body's AF. I think it would be relevant, particularly if the two bodies were of approximately similar AF ability (Not a 1Dx vs. a Merril).
I was thinking that TDP would be a logical authority on this because it is a respected source of reviews, and because its own reviews of the Sigma lenses have often speculated that some communication issue may be operating to give erratic AF. I could also see this being something Roger at Lens Rentals would find curious enough to investigate.
Reply With Quote