JJC CA-EF-RF-K Lens Mount Adapter with Drop-In Filters Canon EF EF-S on EOS R

An adapter and filter system in one: with the JJC CA-EF-RF-K you use Canon EF and EF-S lenses on the mirrorless Canon EOS R cameras – and slide drop-in filters in at the back. The affordable alternative to the Canon Drop-in Filter Mount Adapter EF-EOS R comes with three inserts: a polariser (CPL), a variable ND (ND3–ND500) and a UV filter.

• Adapts Canon EF/EF-S lenses to Canon EOS R – with a drop-in filter slot
• Includes three drop-in filters: CPL, variable ND (ND3–ND500) and UV
• Fully electronic: autofocus, electronic aperture, image stabilisation (IS), EXIF
• Metal, matte interior, detachable tripod foot with 1/4"-20 thread and Arca profile

Lens freedom plus filters at hand

Three drop-in filters included

The polariser (ultra-thin, multi-coated) reduces reflections and glare on non-metallic surfaces such as water or glass and lifts saturation. The variable ND (ND3–ND500) cuts the light steplessly without changing your settings – ideal against overexposure. The UV filter protects against dust and reduces UV influence on the sensor.

Full electronics, no optics in the way

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

How this works in practice

Flexible mounting

The detachable tripod foot relieves the camera mount with heavy EF telephotos. Via the 1/4"-20 thread you put it on a tripod; thanks to the Arca profile it drops straight into Arca quick-release clamps and heads.

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. Certain restrictions may apply depending on the lens/camera combination.

Technical details at a glance

• Type: electronic lens mount adapter with drop-in filter slot
• From: Canon EF/EF-S  →  To: Canon RF (EOS R)
• Drop-in filters: CPL, variable ND (ND3–ND500), UV
• Functions: autofocus, electronic aperture, IS, EXIF transfer
• Material: metal; matte interior
• Tripod foot: detachable, 1/4"-20 thread, Arca-Swiss profile
• Weight: adapter + UV filter approx. 169 g; CPL approx. 16 g; variable ND approx. 21 g
• Dimensions: adapter + UV filter 73.4 x 93.5 x 37 mm
• Model: JJC CA-EF_RF_K
• Barcode: 6950291549730

Scope of delivery

• 1 x JJC CA-EF-RF-K lens mount adapter
• 1 x drop-in CPL filter
• 1 x drop-in variable ND filter (ND3–ND500)
• 1 x drop-in UV filter
• 1 x front cap, 1 x rear cap
• 1 x storage pouch
• 1 x instruction manual