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Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring — main product image
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring
Meike

Meike MK-EFTR-B - EF/EF-S to EOS R Adapter - Control Ring

★★★★★3.5 (13 reviews)

Unlock your full Canon EF lens collection on EOS R bodies — with autofocus, image stabilization, and a customizable control ring.

$79.99*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

For Canon shooters making the move to the EOS R system, a quality mount adapter is the difference between leveraging years of glass investment or starting over. The Meike MK-EFTR-B sits in that practical middle ground — a fully electronic EF-to-EOS-R adapter that adds a control ring without Canon's price premium. It keeps autofocus, image stabilization, and EXIF data intact, making it a workable daily driver for portrait, event, and studio photographers who built their kit around EF-mount glass and aren't ready to replace it.

The adapter is constructed from metal with a rubber gasket at the rear mount interface, providing basic environmental resistance appropriate for studio and casual outdoor use. The control ring rotates smoothly and can be mapped to aperture, shutter speed, or ISO in-camera — a genuine convenience for video work or zone-based street shooting. At 130g it's unobtrusive in the hand, and the electronic contacts are well-finished, making lens swaps feel secure. It's a straightforward, well-executed piece of glass-preservation hardware for the transitioning Canon shooter.

Key Features

Use this adapter when mount a EF/EF-S lens on a EOS R series such as EOS RP, EOS R, EOS R6, and EOS R5 Cameras

Features electronic contacts, support EF/EF-S lens auto focus and vibration compensation the control ring can be assigned the functions that are commonly used with cameras, such as shutter speed and aperture settings

The rear mount on the adapter is fitted with a rubber ring to improve dust-resistance and water-resistance performance.

Support auto focus function, image stabilizers, this rubber ring may cause friction marks to appear around the camera's lens mount, though this wont’t affect on usage.

Is Easy carry when you outdoor shoot, Product weight only 130g

Specifications

Compatibility
EF/EF-S lenses to EOS R series cameras (EOS RP, EOS R, EOS R6, EOS R5)
Electronic Contacts
Yes
Auto Focus Support
Yes
Vibration Compensation Support
Yes
Control Ring Functionality
Assignable to shutter speed, aperture settings
Dust & Water Resistance
Improved with rubber ring on rear mount
Product Weight
130g

Pros & Cons

👍 Pros

  • At 130g the adapter adds almost no perceptible weight, so a full day shooting events with a heavier EF telephoto doesn't punish your wrist.
  • The control ring lets you dial aperture directly on the adapter barrel — useful when shooting video and you don't want to reach for body controls.
  • Electronic contacts preserve EXIF transmission, so focal length, aperture, and IS data are recorded in every frame's metadata.
  • Dust and moisture resistance at the rear mount gives you peace of mind in dusty studio or outdoor environments.
  • Metal construction feels solid in hand and inspires confidence that the flange distance will stay consistent across sessions.

👎 Cons

  • No tripod foot or collar mount point, so long heavy EF telephoto lenses are front-heavy when balanced on a tripod — you'll need a dedicated lens collar.
  • The rubber sealing ring can leave cosmetic friction marks around the camera's lens mount over time, which may concern photographers protective of their bodies.
  • AF speed with older, screw-drive EF lenses is noticeably slower than with native RF glass — this adapter cannot improve a lens's own motor.
  • There is no drop-in filter slot, unlike Canon's own adapter variants, so ND or CPL filtration must be added at the front element.
  • Third-party adapter compatibility with future EOS R firmware updates is not guaranteed — Canon occasionally changes electronic protocols.

Frequently Asked Questions

Yes — the adapter passes full electronic communication through its contacts, so phase-detect and contrast-detect autofocus work as they would on native EF-mount bodies. AF performance is largely determined by the lens itself, not the adapter.
The control ring on the MK-EFTR-B can be assigned to functions like aperture, shutter speed, or ISO — the same as Canon's own mount adapter — through your EOS R camera's customization menu.
Yes. The electronic contacts transmit IS control signals, so optical stabilization in your EF lenses remains fully functional, which matters most when shooting handheld at slow shutters.
A rubber ring is fitted at the rear mount to improve dust and water resistance at the camera-adapter interface. Note that the manufacturer acknowledges this ring may leave minor friction marks around the lens mount — it doesn't affect function.
The adapter is compatible with the Canon EOS R, RP, R5, R5C, R6, and C70. It is not designed for the EOS M or EF-M mount system.

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