This Novoflex M42 to Micro Four Thirds Lens Adapter allows you to use M42 lenses on SLR cameras with the Micro Four Thirds lens mount. The adapter ensures a high-precise correction of the flange focal length difference and enables focusing to infinity. Moreover, automatic exposure metering via working aperture and aperture priority is supported.
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Backfocus dimension is eerily perfect, seems to reach infinity exactly at the infinity stop on the lens. Slightly worrying: what if it doesn't quite reach infinity? On the other hand, why argue with perfection? This appears to be a single piece of metal, finished inside and out with some matte black anodizing or paint. Slightly worrying: what if it wears off and leaves black dust inside the camera? Chrome plated wearing surfaces would be more reassuring. But again, no actual sign of a problem. Orientation of the lens when screwed on: quite acceptable, pretty close to centered. Fortunate, since it can't be adjusted. Price: surprisingly low for something from this premium brand. So, hey, seems like by far the best option out there for this kind of adapter.
The Novaflex adapter has let me use my wonderful really old Pentax M42 50mm macro lens again, on my Panasonic GF1 and GH2. With the crop factor of 2, the lens becomes a 100 mm in 35mm terms, a very convenient focal length for macro work. The build quality on the adapter is excellent.