Canon Control Ring Mount Adapter EF-EOS R

The Canon Control Ring Mount Adapter EF-EOS R is an official Canon mount adapter that lets photographers use Canon EF and EF-S lenses on Canon’s RF-mount EOS R mirrorless cameras, while adding a customizable Control Ring not found on the basic version of this adapter. It’s aimed at photographers transitioning from EF-mount DSLRs to EOS R bodies who want to retain the tactile control-ring functionality of native RF lenses while continuing to use their existing EF and EF-S glass.

The adapter maintains full electronic communication between lens and camera, preserving autofocus, image stabilization, and automatic aperture control exactly as they function when an EF or EF-S lens is mounted directly to an EF-mount body. There are no optical elements inside the adapter, meaning it introduces no image quality degradation, change in effective focal length, or light loss, functioning purely as a mechanical and electronic pass-through that maintains the original lens’s optical quality.

What distinguishes this version from Canon’s basic EF-EOS R adapter is its built-in Control Ring, the same functional element found on native RF-mount lenses, allowing photographers to intuitively adjust exposure settings such as ISO, aperture, and exposure compensation directly from the adapter. The ring includes a clicking mechanism that provides tactile, perceptible feedback with each adjustment, and this click can be removed at a Canon Service Center for a fee if quieter, stepless operation is preferred, useful for video work where audible clicks are undesirable.

Build quality matches Canon’s other lens mount hardware, with a metal lens mount on both ends for a secure, precise connection, along with dust- and water-resistant construction and an exterior design matched to Canon’s EF lenses. The adapter measures approximately 74.4 x 24.0mm and weighs about 130g on its own. Because it supports full EF and EF-S lens compatibility, photographers can carry over their existing autofocus lenses without any loss of functionality on EOS R bodies, while gaining the added convenience of a control ring for lenses that didn’t originally include one.

Key Features
– Adapts Canon EF and EF-S lenses to EOS R mirrorless camera bodies
– Built-in customizable Control Ring (ISO, aperture, exposure compensation, etc.)
– Removable clicking mechanism for tactile or silent ring operation
– Maintains full autofocus, image stabilization, and aperture control
– No optical elements — no image quality loss or light loss
– Metal lens mounts on both ends
– Dust- and water-resistant construction
– Approximate dimensions: 74.4 x 24.0mm; weight approximately 130g
– Compatible with EF and EF-S lenses on Canon RF-mount EOS R cameras