Is focus-by-wire part of the m43 specification?


Mu-43 Rookie
Jun 14, 2010
what the subject says. Just curious if it's possible/likely that anyone will make more micro four-thirds lenses with conventional MF mechanisms that actually offer some tactile feedback or distance scale. I didn't really mind the focus-by-wire on the 14-42 and 20 until I got to playing with legacy MF lenses. those just felt better to use...


Mu-43 All-Pro
Jan 19, 2010
Real Name
My best guess is that it is simply the tech carried over from olympus and panasonic's standard 4/3 mount lenses. Perhaps it is easier to design a smaller lens (which was supposed to be some of the appeal even to the regular 4/3 mount) with a motor that can couple and de-couple from the focus ring without having any set limit to the focus ring itself. Since the 4/3 standard itself was a new arena, they probably started from scratch, and came up with the focus by wire for some reason or another.

subsequent question - does sigma use the focus by wire in their 4/3 mount lenses?

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