650D and STM lenses - Consensus?

Started Jul 14, 2012 | Discussions thread
boels069 Contributing Member • Posts: 553
Re: 650D and STM lenses - Consensus?

WilbaW wrote:

  • What are the benefits of STM? (How does it compare with USM? Can you do FTM with it?)

(I have the EF 40 f/2,8 STM on a 5DII, maybe it works different on a 650D)

FTM is not possible, the focus ring is disengaged from the AF-mechanism when in AF-mode.

In MF-mode the focus ring has no stops, turns very smoothly (like "fly by wire") and is fast, just using a vinger top.

Really fast moving the ring produces a high wining sound, demonstrating the possible high focus speed.

 boels069's gear list:boels069's gear list
Canon EOS 5D Mark II Canon EF 100mm f/2.8L Macro IS USM Canon EF 24-105mm f/4L IS USM Canon EF 70-200mm f/4L IS USM DxO Optics Pro Elite +2 more
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