Leica 28mm f/2 Summicron-M ASPH. M-Mount Lens, Germany, Black, 6-Bit {E46} 11604

Leica's sharpest 28mm M-mount lens, built in Germany.

The Summicron-M 28mm f/2 ASPH. sits at the intersection of wide-angle reach and low-light capability that most M-mount shooters spend years chasing. The aspherical optical design keeps edge rendering honest at f/2, where lesser wide-angles fall apart, and the 46mm filter thread keeps the package compact enough to disappear into a jacket pocket. At f/2, this focal length becomes a tool for available-light work that a slower 28mm simply cannot match.

The 6-Bit coding communicates lens data directly to Leica M digital bodies, triggering automatic vignetting and distortion corrections without any manual input. That matters most when shooting flat architecture or evenly lit scenes where subtle falloff would otherwise require post-processing attention. Manufactured in Germany, the barrel construction reflects the kind of mechanical tolerances that keep focus throw consistent and repeatable over years of daily use.

For the money spent on an M-system body, pairing it with a lens that reports its own optical profile to the camera is the logical choice. This lens earns its place in a working kit.

Who It's For

Street photographers working in mixed or low artificial light will find f/2 at 28mm gives enough spatial context to show a subject within their environment while still separating them from a busy background. Documentary shooters benefit from the 6-Bit coding keeping corrections automatic so attention stays on the moment. Travel photographers who run a single-lens kit get a focal length that handles architecture, interiors, and candid portraits without changing glass. Leica M digital shooters specifically will see the lens profile communicated directly to the body, reducing correction work in post.

Key Features

• 28mm focal length with f/2 maximum aperture for low-light work
• ASPH. aspherical optical design for edge-to-edge sharpness at wide apertures
• 6-Bit coding triggers automatic vignetting and distortion correction on digital M bodies
• E46 filter thread keeps the barrel compact
• Leica M bayonet mount
• German manufactured mechanical construction
• 46mm filter thread

FAQ

Does this 28mm work on film M bodies or only digital?

It works on both film and digital M bodies. The 6-Bit coding only activates automatic vignetting and distortion correction on compatible digital M cameras; film bodies simply ignore the encoding and perform normally.

How does the f/2 aperture compare to other M-mount 28mm options?

Most M-mount 28mms max out at f/3.5 or f/5.6. The f/2 maximum aperture gives you a full stop or more of light advantage for available-light work, which fundamentally changes how you can shoot in dim interiors or at dusk without pushing film speed.

What does the ASPH. design actually do?

The aspherical lens element corrects spherical aberration and edge distortion that would otherwise soften corners at wide apertures. You get clean rendering all the way to the edges at f/2, which is where cheaper wide-angles start to blur and lose contrast.

Is the E46 filter thread standard for 28mm lenses?

E46 is a common mid-sized filter thread, smaller than typical 50mm lenses (usually E52) but larger than compact wide-angles. It strikes a balance between keeping the lens compact and using reasonably priced, readily available filters.

Does the 6-Bit encoding require any camera firmware or manual setup?

No. Once mounted on a compatible Leica M digital body, the lens communicates its optical profile automatically. Vignetting and distortion corrections apply without any menu navigation or input from you.

How does German manufacture affect build quality compared to lenses made elsewhere?

Leica's German production maintains tighter mechanical tolerances in the focus helicoid and bayonet seating, which translates to consistent focus throw and less play in the mount. That consistency matters over years of heavy use.