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EXCERPT page containing first few paragraphs. 2022-08-17 21:37:59

Sony NEX-7

Usability Issue — Focus By Wire Hysteresis

When I started testing the NEX-7, I used manual focus lenses. Focus carried no surprises.

Obtaining the autofocus Sony/Zeiss 24mm f/1.8 some time later, I took one look and applauded the generous focusing ring on the lens.

But as soon as I used the 24/1.8, I discovered that the focus-by-wire (no mechanical linkage) was a headache, because physical feedback is non-existent, and there is hysteresis— go a little too far, back up by the same amount, and you’re not back to the same place. I find this extremely frustrating after working with Leica and Zeiss manual focus lenses.

UPDATE May 2013: the Zeiss Touit 32mm f/1.8 Planar and 12mm f/2.8 Distagon offer focusing that is more friendly, perhaps because of the more powerful focusing motors and new design.

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