Lmount

L-mount is a lens mount standard for interchangeable-lens cameras, developed by Leica Camera AG in collaboration with Panasonic and Sigma. Forming the L-Mount Alliance, the standard is designed to enable cross-brand interoperability among cameras and lenses from the participating manufacturers. It supports both full-frame and, in some bodies, smaller-sensor formats such as APS-C, with a focus on compact form factors and robust optical performance.

The mount uses a three-lug bayonet design paired with a short flange focal distance, which helps keep camera bodies compact while accommodating a wide range of high-performance lenses. It provides a multi-pin electronic interface that allows full communication between camera and lens, enabling autofocus, auto exposure, electronic image stabilization data, and metadata transmission. The physical and electronic features are intended to support advanced stills and video capabilities across the alliance’s lens and body lineup.

Ecosystem and adoption have grown since the alliance’s formation, with Leica’s SL-series bodies, Panasonic’s Lumix S-series, and Sigma’s fp line as prominent examples of L-mount cameras. Over time, the lineup has expanded to include numerous L-mount lenses from all three brands, along with compatible accessories and continued development focused on image quality, video features, and low-light performance. The alliance aims to maintain a cohesive ecosystem where lenses and bodies from different members are designed to work together under a unified standard.

See also: Leica L-mount, L-Mount Alliance, Leica SL, Panasonic Lumix S series, Sigma lens lineup.