Leica Summarit-M 50mm f/2.5

Leica Summarit-M 50mm f/2.5

When Leica launched the Summarit-M line in 2007, it revived the Summarit name to mark a more accessible tier of M-mount glass, and the 50mm f/2.5 sat at the heart of that range as the system's compact standard lens [1][2]. Built around a classic double-Gauss layout of six elements in four groups, it was presented by Leica as an updated take on a long-proven optical design, intended for everyday photography rather than as a speed or character showcase[4]. On the digital M8 of the period its field of view corresponded to roughly a short telephoto, which Leica positioned as useful for portraits and detail work, while on film bodies it served as a conventional 47-degree normal lens.

The lens uses an all-metal barrel and is offered in black, with a 39mm filter thread and a nine-bladed diaphragm intended to keep out-of-focus areas smooth[3]. It is rangefinder coupled and focuses to 0.8 m, slightly longer than the 0.7 m of the contemporary 50mm Summicron, a difference reviewers generally found inconsequential in use. The mount carries six-bit coding so that Leica digital bodies from the M8 onward can identify the lens automatically and apply the appropriate corrections and frame lines. Its small size and modest weight make it balance well on compact film bodies such as the M3, which is part of its appeal as a lightweight travel or street option.

The f/2.5 version is the original Summarit-M 50, distinguished by a square clip-on hood. It was later succeeded by an f/2.4 revision that adopted a heavier screw-in hood and revised cosmetics; the optics are widely reported to be essentially unchanged between the two, with the differences concentrated in build and presentation [5]. The f/2.5 lens carries model number 11644.

Optical qualities

Rendering Reviewers consistently describe the lens as optically neutral, imposing little character of its own and rendering in a clean, modern way rather than with the glow associated with older Leica 50mm designs. The symmetrical double-Gauss construction is credited with a flat field and good chromatic correction.

Sharpness Users report the lens is usable wide open and sharp across common apertures, in line with its everyday-standard-lens role.

Flare resistance One repeatedly noted weakness is a tendency to produce large blue or green flare blobs in certain backlit situations, a trait raised in hands-on reviews.

Distortion and vignetting Leica's own materials mention some vignetting at full aperture, though at least one reviewer reported seeing only the slightest trace of it in practice.

History

Development and Launch The Summarit-M family debuted in 2007 as a set of four lenses, 35mm, 50mm, 75mm and 90mm, all sharing a maximum aperture in the f/2.4 to f/2.5 class and a common 39mm filter size, aimed at offering a comparatively lower-cost entry into M-system optics. The 50mm f/2.5 was the smallest of the group and was marketed as a versatile general-purpose lens for both film and the digital M8.

Production Evolution The original f/2.5 lenses were later replaced by an f/2.4 generation that revised the external design, most visibly the lens hood, while reportedly retaining the same optical formula.

Collector Notes The modern Summarit-M 50mm f/2.5 should not be confused with the much older Leica Summarit 50mm f/1.5 screw and bayonet lens, which is an entirely different and far older optical design with the classic vintage rendering. Buyers comparing it against the 50mm Summicron should note the close focus difference of 0.8 m versus 0.7 m and the relatively small price gap that historically prompted some shoppers to step up to the Summicron. Worthwhile points to verify on a used example include the presence of the original square clip-on hood and front and rear caps, since these are easy to lose, and confirmation that the lens is the f/2.5 model rather than the later f/2.4 revision.