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Lens Adapter Skew
In testing Leica M and Voigtlander M and Zeiss ZM lenses on the Sony NEX-7, one must use a lens adapter. I used a Novoflex adapter and obtained some very nice results, but also some disturbing results as follows.
I took the snapshot below with the NEX-7, Novoflex lens adapter and Leica 28mm f/2 Summicron-M ASPH (it appears that the photographer is using a Sony NEX also!).
(!)
I focused on the woman at left; her face is reasonably sharp and the background behind her is blurred. Yet the face of the woman at right is blurred, and the background in the far distance is sharp. This is a skew of the plane of focus (a “swing”), presumably from a bad lens adapter, though it could be the camera itself, or (unlikely) the lens.
Click for a large crop, or see crops below.
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