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| p.1 #3 · what is focus by wire? |
The manual focus ring is not physically coupled with the focusing mechanism. Rather, rotating the ring sends an electronic signal to the focusing mechanism. In practice, this means that the lens must be mounted on a camera body (and therefor receiving power) in order to change the focus. No big deal, really. And the manual focus ring has a very "loose" feel to it, more like a lack of resistance, compared to other lenses.