Nifty fifty STM - focus issues, or human error?

Started Nov 16, 2017 | Discussions thread
ThrillaMozilla Veteran Member • Posts: 3,333
Re: Nifty fifty STM - focus issues, or human error?

archiekar wrote:

TMHKR wrote:

If I keep half-pressing the shutter button several times (while holding focus point on target), the lens jumps a tiny bit at each half-press. It attempts to refocus, but instead it just jumps a millimeter here, a millimeter there (half-press = focused, half-press = unfocused, and so on). I believe that's just how it works.

Yes it is in part how it works, the focus ring has play as do the teeth that control it so there is a lack of precision. The jump is quite fast and I believe it uses an inerpolation algo of some sort so it is not just a move in one direction but rather just past and back.

Well, no.  Manual focusing does indeed have some play on at least some STM lenses, but TMHKR's comment has nothing to do with the focus ring.

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