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Slowly beginning to realize (learn) something important...(Quattro / Merrill) ?

Started Apr 21, 2019 | Discussions thread
danski0224 Senior Member • Posts: 1,465
Re: Slowly beginning to realize (learn) something important...(Quattro / Merrill) ?
1

While I do not know for certain, I suspect that the Global Vision lenses have better internal and camera communication and finer control over the focus motor, which seems to be a requirement for good AF driven by the image sensor.

I also suspect that this is not a Sigma only problem, although Canon EF lenses reportedly work fine on the R camera using the OEM adapter.

As far as old Sigma lenses with a micro motor, my 70mm macro has dismal AF performance on my Canon DSLR. The SA mount version of that lens is no better on a Sigma camera.

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