Originally posted by ChristianRock Do they cover the APS-C circle? I did not know that you could do this. How do they perform? It never occurred to me to to this, but now I see there's an adapter for M4/3 to NEX...
I also see you can't use any of the "focus by wire" lenses.
Yep, the Pen F lenses do indeed cover the APS-C circle, as the original half-frame Pen F was a miniature rangefinder-ish camera with a short registration distance. The Pen F to E-mount adapter is quite thin, so a Nex with a Pen F lens is a small package. The lenses work great, particularly the 38 f/1.8, and prices for them on eBay are rather high, unless you happen to find a seller who isn't trying to hit a home run on each lens.
I've never had any focus by wire lenses, so can't address that.