Patent: Impressive super telephoto L zoom lenses for the RF mount

Nemorino said:

I tested the tamron for 1 1/2 hours in a local park this week on a R5 and the AF performance is the reason why I won`t buy one.

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The Sigma Contemporary does not focus very well on my R5 either

EOS 4 Life said:

The Sigma Contemporary does not focus very well on my R5 either

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From all the reports and posts I've heard and read, all of the 150-600 variants are optically superior on R cameras vs dslrs yet lack in the AF department. So, for servo uses, pass but of you are a perched/still life shooter, it might be in your interest to adapt I guess.