Viltrox EF-M to EF Lens Mount Adapter

The Viltrox EF-M to EF Lens Mount Adapter is a third-party mount adapter designed to let photographers use their Canon EF and EF-S lenses on Canon’s EOS M-series mirrorless camera bodies, giving EOS M owners access to Canon’s much larger EF/EF-S lens ecosystem. It’s aimed at photographers who have invested in EF-mount glass and want to continue using it after moving to a compact EOS M mirrorless body.

The adapter maintains electronic communication between lens and camera, supporting autofocus, image stabilization, and automatic aperture control in a manner intended to replicate how an EF or EF-S lens behaves when mounted directly to an EF-mount DSLR. Because it functions as a simple mechanical and electronic pass-through with no optical elements inside, it introduces no change in effective focal length and no optical degradation, serving purely to bridge the physical and electronic gap between the EF/EF-S and EOS M mount systems.

Build quality centers on a metal lens mount on both ends of the adapter for a secure, precise connection to both lens and camera body, consistent with the construction expected of a mount adapter supporting the physical load of an attached lens. The adapter preserves the original lens’s minimum focusing distance and magnification, since it functions by extending the flange distance to match the EOS M system’s shorter mount-to-sensor distance rather than altering the optical path.

As a third-party alternative to Canon’s own EF-EOS M adapter, compatibility and autofocus performance can vary somewhat by specific lens model compared to using Canon’s first-party adapter, so photographers with particularly new or specialized EF lenses may want to confirm compatibility for their specific combination before relying on it for critical work. For photographers using common EF and EF-S lenses with standard autofocus systems, it offers a straightforward way to adopt Canon’s EOS M mirrorless bodies while continuing to use lenses already in their kit.

Key Features
– Adapts Canon EF and EF-S lenses to Canon EOS M-series mirrorless camera bodies
– Maintains autofocus, image stabilization, and aperture control
– No optical elements — no image quality loss or focal length change
– Metal lens mounts on both ends
– Preserves original lens focal length, minimum focusing distance, and magnification
– Third-party alternative to Canon’s first-party EF-EOS M adapter