ahsanford said:Are you saying Nano USM is faster than Ring USM?
All I can say is that Nano USM is insanely fast. I don't own a nano USM lens (yet), but had the chance to try that 18-135 on a 80D body, and I have never felt a lens that focused that quick.
I have never felt a lens that focused that fast from any brand for that matter. It's as if the lens is always in focus, since it seems faster than my eye could focus.
Some STM lenses aren't that fast, like the 40mm STM, it's not fast, it's kinda slow. But some STM, like the 18-55mm STM, are quite fast. But nothing compared to the Nano USM I tried, it's way way faster than any other APS-C lens from Canon I know of.
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