Leica Summilux-M 75mm f/1.4 III

Leica Summilux-M 75mm f/1.4 III

Walter Mandler designed the 75mm Summilux at Leitz Canada around 1980, and it became one of the most sought-after fast portrait lenses in the M system, sometimes described as the designer's own favorite [1]. The version recorded here, often called Version III, is the German-built variant of the design. It uses a seven-element formula in five groups, the same optical layout carried across all three production versions, and adds a built-in (retractable) hood with an E60 filter thread[2]. By the standards of later 75mm Leica optics, it is a comparatively soft-contrast lens, set apart from the higher-correction 75mm APO-Summicron-M of 2005 and the much later 75mm Noctilux.

The lens is a moderate telephoto built to the usual M standard, with a brass-and-aluminium barrel, a ten-blade diaphragm, full rangefinder coupling, and a minimum focus distance of 0.75 m. Wide open the depth of field is very shallow, which is the trait that made it a favorite for isolating a subject from its background, and focusing accuracy at f/1.4 is critical. The German Version III is not six-bit coded from the factory, so users who want automatic lens recognition on digital M bodies typically have it added during a service visit. On mirrorless cameras adapted from M-mount, reviewers note that the optical formula shows focus shift, though this is easily managed when focusing on the working aperture.

The 75mm Summilux exists in three versions that are optically identical, differing mainly in barrel, hood and weight. The first Canadian version (model 11814) had a separate ventilated clip-on hood; the design was soon revised with a built-in hood (model 11815), which slightly increased the weight. Version III was produced in Germany, looks essentially like the built-in-hood Canadian version, and is somewhat lighter; reviewers report it tends to command a small premium over the earlier copies. Reeve also notes minor coating tweaks between versions that can produce slightly different contrast, fringing and flare. The same optical design was offered in Leica R reflex mount as the 80mm Summilux-R f/1.4.

Optical qualities

Rendering The 75mm Summilux is known for a distinctive, comparatively low-contrast signature at its widest apertures and a strong subject-isolation effect from its shallow depth of field. It is widely regarded as a portrait lens whose character comes from the interplay of its imperfections, color and contrast rather than clinical correction.

Sharpness At f/1.4 spherical aberration is heavy and only the central portion of the frame is crisp; stopping to f/2 brings a clear improvement, with the center excellent and the midframe and corners progressively better as aberrations diminish and contrast rises.

Bokeh and transitions Stopping down smooths the background blur noticeably while extending sharpness outward. Like many fast portrait lenses, it shows cat's-eye (mechanical) vignetting toward the edges, with circular highlights in the center deforming as they move to the corners.

Aberrations Spherical aberration dominates the wide-open look, and the design exhibits focus shift as it is stopped down, a non-issue on mirrorless bodies focused at the taking aperture.

History

Development and Launch The lens was designed around 1980 by Walter (Werner) Mandler, CEO and chief lens designer at Leitz Canada, the Midland, Ontario plant established after the Second World War as a manufacturing safeguard for Leica. Mandler was an early adopter of computer-aided lens design, and the 75mm Summilux is often cited as a lens he was personally proud of.

Production Evolution The first version (1980 to 1982, model 11814) shipped with a separate ventilated hood; it was then revised with a built-in hood (model 11815), which added a little weight. The German-built Version III followed the same seven-element, five-group optical formula, retained the E60 filter thread and built-in hood, and weighs less than the earlier Canadian built-in-hood version, with reviewers describing only minor coating differences between the variants. The line was discontinued in 2007.

Special editions No widely documented factory special editions, military or commemorative finishes are recorded for this lens. The same optical design was, however, produced in Leica R reflex mount as the 80mm Summilux-R f/1.4.

Collector Notes Buyers should confirm which version they are handling, since the Canadian and German built-in-hood versions look very similar and differ mainly in weight, with Version III typically priced at a slight premium. The factory German lens is not six-bit coded, so a coded example has usually been to Leica for service; this is also an opportunity for a focus check. As with any older Leica fast tele, verify smooth focus, the condition of the retractable hood, and clean glass before buying. One small discrepancy worth noting: some sources quote the minimum focus distance of the later versions as 0.8 m, while LeicaLensList records 0.75 m for this version.