Leica 28mm f/1.4 Summilux-M ASPH. M-Mount Lens, Germany, Black, 6-Bit {E49} 11668

Leica's fastest 28mm prime for M-mount rangefinders

At f/1.4 on a 28mm focal length, this lens occupies a genuinely rare position in the M-system lineup. The 10-element, 7-group optical formula incorporates one aspherical element alongside a floating elements system, keeping distortion and field curvature in check from the minimum focusing distance of 70cm all the way out to infinity. Seven of those elements are ground from anomalous partial dispersion glass, which works alongside three cemented groups to keep color fringing minimal and contrast consistent across the full aperture range.

The 75-degree angle of view pairs naturally with reportage and documentary work, where f/1.4 gives you a real fighting chance in dim interiors, stage lighting, or late evening streets without resorting to high ISO. The focusing tab aids precise manual focus control when you need to pre-focus quickly. 6-bit coding communicates lens data to digital M bodies, enabling automatic vignetting and distortion corrections in-camera. At 440g and 81mm in length, it carries well on a M body without upsetting the balance that makes rangefinder shooting practical for long days on the street or travel.

For architecture and landscape shooters, the low-distortion design means straight lines stay straight, and stopping down toward f/8 or f/11 delivers edge-to-edge sharpness across a full-frame sensor. The 49mm filter thread keeps polarizer and ND costs reasonable. This is a lens built to perform across a wide range of conditions than excel at one narrow task.

Who It's For

Documentary and street photographers working in unpredictable light will find f/1.4 at 28mm gives them a wide, fast option that keeps the rangefinder form factor intact. Travel photographers who want one lens to handle cafes, markets, and architecture without switching will appreciate the low-distortion design and compact dimensions. Architecture shooters benefit from the floating elements system holding aberrations in check at close focusing distances. Film M-mount shooters with digital M bodies get the added benefit of 6-bit lens coding for automatic correction profiles.

Key Features

• f/1.4 maximum aperture, rare specification for 28mm M-mount focal length
• 10-element, 7-group optical formula with one aspherical element
• Seven anomalous partial dispersion glass elements minimize color fringing
• Floating elements system controls distortion from 70cm to infinity
• 6-bit coding for automatic vignetting and distortion correction on digital M bodies
• 75-degree angle of view optimized for reportage and architectural work
• 49mm filter thread, 440g weight, 81mm length

FAQ

What makes f/1.4 on a 28mm focal length so rare?

At this combination, you get genuine low-light performance with a wide field of view-most 28mm M-mount primes top out at f/2. The f/1.4 aperture lets you shoot stage lighting or dim interiors without pushing ISO, and gives you real selective focus control at a wider focal length than standard fast primes.

How does the aspherical element and floating system control distortion?

The aspherical element corrects field curvature while the floating elements adjust their spacing at different focus distances, keeping distortion and aberrations minimal from the 70cm minimum focus point through infinity. This matters for architecture and landscape work where straight lines need to stay straight.

What's the practical difference between this and other fast 28mm M-mount lenses?

This is the fastest 28mm in the M-system lineup. The seven anomalous partial dispersion elements plus three cemented groups deliver color fringing control and consistent contrast across the full aperture range-you won't see the aberration shift that slower designs sometimes exhibit when you stop down.

How does 6-bit coding work on digital M bodies?

The lens communicates its optical characteristics to the camera body, which applies automatic vignetting and distortion corrections in post-capture processing. Optical and digital corrections work together to optimize the final image.

Is this lens practical for travel and street work?

Yes. At 440g and 81mm long with a 49mm filter thread, it balances well on an M body without creating fatigue on long shooting days. The 75-degree angle of view suits reportage naturally, and f/1.4 handles dim interiors and evening light without forcing higher ISO.

What aperture range delivers edge-to-edge sharpness for landscapes?

Stop down to f/8 or f/11 and you get consistent edge-to-edge sharpness across the full frame. The low-distortion design means you won't need software correction for architectural straight lines either.