How Much Faster is T4i Autofocus in Live View Compared to T3i? Real World Experience Please?

Started Nov 29, 2012 | Discussions thread
WilbaW Forum Pro • Posts: 11,562
Re: Live View AF speed varies depending on the lens.

Lemming51 wrote:

The T4i's fastest live view focusing will be with the new STM lenses, EF-S 40 and EF-S 18-135. Other lenses using micromotor, micro-USM, and ring-USM will be slower than STM on the T4i.

I don't think that's right. STM isn't necessarily faster (it can be quite slow, as on the 40/2.8 pancake), it's just quieter, so it's better for continuous AF with video.

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