JJC CA-EF-RF Lens Mount Adapter – Canon EF EF-S Lenses on Canon EOS R

With the JJC CA-EF-RF you keep using your Canon EF and EF-S lenses on the mirrorless Canon EOS R cameras – the affordable alternative to the Canon Mount Adapter EF-EOS R. The adapter transfers all functions fully electronically and contains no optical elements, so image quality stays unchanged.

• Adapts Canon EF/EF-S lenses to Canon EOS R (mirrorless)
• Fully electronic: autofocus, electronic aperture, image stabilisation (IS) and EXIF transfer
• Premium metal, matte interior against reflections, O-ring seal on the camera mount against dust
• Detachable tripod foot with 1/4"-20 thread and Arca-compatible profile

Full function without image loss

Electronics like the original

Via the gold-plated metal contacts and data chip, autofocus, electronic aperture control, image stabilisation (on IS lenses) and EXIF data transfer are all retained. You control aperture, shutter speed, ISO and exposure through the camera as usual.

Sturdy and sensor-friendly

The metal body is sturdy and durable, and the matte interior suppresses reflections. The O-ring seal on the camera mount keeps out dust and so protects your EOS R's sensor.

How this works in practice

Flexible mounting

The detachable tripod foot takes the weight of heavy EF telephotos off the camera mount. Via the 1/4"-20 thread you put it on a tripod, and thanks to the Arca-compatible profile it drops straight into Arca quick-release clamps.

What you should know before you order

Canon EF/EF-S only

Suitable for Canon EF and EF-S lenses – not for RF, EF-M or CN-E (EF Cinema) lenses. Not compatible with the Tamron SP 150-600mm f/5-6.3 Di VC USD for Canon (A011) or with Sigma EF/EF-S lenses.

Usage notes

Depending on the lens, the minimum focusing distance may increase slightly (affecting maximum magnification/field of view). Set lens functions via the switches on the lens; if settings differ, those on the lens take priority. Certain restrictions may apply depending on the lens/camera combination.

Technical details at a glance

• Type: electronic lens mount adapter (no optical elements)
• From: Canon EF/EF-S mount  →  To: Canon RF (EOS R)
• Functions: autofocus, electronic aperture, IS, EXIF transfer
• Contacts: gold-plated metal contacts with data chip
• Material: metal; matte interior; O-ring dust seal on the camera mount
• Tripod foot: detachable, 1/4"-20 thread, Arca-compatible profile
• Model: JJC CA-EF_RF
• Barcode: 6950291549716

Scope of delivery

• 1 x JJC CA-EF-RF lens mount adapter
• 1 x front cap, 1 x rear cap
• 1 x adapter foot, 2 x screw, 1 x screwdriver
• 1 x storage pouch
• 1 x instruction manual