Leica Summicron-R 50mm f/2 (v1)

Skin and out-of-focus foliage come off this lens looking rounded rather than etched, a gentle falloff from the focus plane that later Leica fifties traded away for bite. That is the fingerprint of the first Summicron-R 50mm: a double-Gauss with good contrast in the midtones but a softer high-frequency edge than the second version that replaced it. Stopped to f/4 it sharpens up everywhere. But people do not buy the v1 to win resolution charts. They buy it for the rendering, and the rendering is the whole argument.

Leica built it for the Leicaflex, the company's late and somewhat reluctant entry into SLRs, so the optical brief was different from the rangefinder Summicrons. It had to clear a reflex mirror, which the compact M Summicrons never needed to do. The result is a six-element Gauss derivative that draws with a warm, low-microcontrast signature wide open, the kind that flatters faces without smearing fine detail into mush. Backgrounds dissolve cleanly. Specular highlights stay round across most of the frame and only stretch toward cat-eye shapes in the extreme corners at f/2. Worth noting that the original 1964 Leicaflex metered with an external CdS cell on the prism housing, not through the lens. TTL metering arrived later with the SL and the R bodies, so the lens itself was never designed around it.

At f/2 the age shows. There is a touch of veiling glare against bright backlight, and contrast drops a notch shooting into the sun without a hood, so use the dedicated shade. Field curvature is mild but present, which means flat-subject copy work wide open will show soft corners that snap back into line by f/5.6. None of that matters for what the lens is good at. Loose, close-range work where you want a face to sit forward of a quiet, well-behaved background.

The honest weakness is partly that it sits in its own successor's shadow. The 1976-on second version is sharper wide open and is usually the one collectors name first, so the v1 gets cross-shopped against it and loses on paper every time. If you want clinical, buy the later one. The v1 is the character pick. R-mount glass has generally traded below comparable M lenses, which makes this one of the cheaper doors into genuine Leica drawing, and mirrorless adapters have kept demand alive because the look carries over to a modern sensor without much fuss.

One metering note. The 43mm front thread is your reference if you screw on an ND or a polarizer to hold f/2 in daylight, and Zone Light Meter lets you dial that filter factor in so the reading stays honest. The lens has no shutter and no flash sync of its own; exposure timing lives entirely in the camera body. In dim light, meter the scene wide open first to confirm you actually have the shutter speed you think you do before you commit the frame.