Zunow 5cm f1.1 mid type. Leica screw mount with rangefinder coupling. Serial numbers are in the 6000 range. Engraved Zunow Opt. In 1955 the company name changed from Teikoku Optical to Zunow Optical Industry, and the lettering on the name ring was updated accordingly. The helicoid distance scale is in feet.
The Zunow 50mm f1.1 (early type, Pin-pong) appeared in 1953. At the time, Teikoku Optical was almost unknown, yet it made a sensational debut by introducing the brightest lens in the world. This Zunow lens ignited the Japanese ultra-fast lens race, leading to a wave of remarkable f1-class lenses from Konishiroku, Nippon Kogaku, Canon, Fuji Photo Film, and others.
The barrel design, with its rhythmic waistline and knurling, is truly handsome, paired with the unique Zunow brand name. Its wide-open rendering is filled with dramatic flare, and although it had a short production life, it must have stirred the hearts of postwar Japan as the world’s brightest standard lens. A uniquely compelling Japanese ultra-fast lens, rich in charm and story.
This mid-type Zunow eliminates the protruding rear element of the early Pin-pong version, making lens mounting and removal less nerve-racking, and it also gives the impression of reduced flare near wide open. Despite its short production run, Zunow exists in many variations, but the flat-rear-element type seen here is probably the most common.
Stopping down one or two clicks from full aperture tightens the rendering dramatically, with a striking increase in image clarity, almost like switching to a different lens. A lens that is delightful both to admire and to shoot with.
A rare piece.
There is a single small ding on the base and a few minor use marks on the helicoid ring, but overall it is a clean example of the Zunow. It is a piece that lets you appreciate the quality of its construction.
Fully overhauled in November 2025, including focus calibration. The aperture and helicoid now operate with smooth precision, and the rangefinder coupling is spot on.
There are three somewhat deep marks on the rear element, though none had any visible impact on actual photographs. It is a bit regrettable given the otherwise excellent overall condition. Apart from that, the glass is clear with no haze and delivers a crisp, clean image.
Rangefinder accuracy is well maintained and the lens performs beautifully, making this Zunow an ideal choice for those who want to actively enjoy shooting with it. A third-party front cap and filter are included.
Sample images have been uploaded to the Test Shot Gallery, all taken near maximum aperture. The rendering carries a soft veil while still forming a well-defined core, creating a pleasing balance of softness and clarity. The stability characteristic of the flat rear element also leaves a strong positive impression.
