K&F Concept C-EOS R – C-mount Lens to Canon RF Mount Adapter K&F Concept

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The K&F Concept C-EOS R adapter mounts lenses with the C (C-mount) thread on cameras with the Canon RF mount. It is purely mechanical, with no electronic contacts: focusing is done by hand on the lens and the aperture is set with the lens aperture ring. The all-metal adapter is precisely machined and coated inside with matte anti-reflection paint.

C-mount lenses on Canon RF bodies

With the C-EOS R adapter, C-mount lenses can be used on a modern Canon RF body with everything it offers – a viewfinder with magnification for precise manual focusing, sensor stabilisation if the body has it, and current recording formats.

Solid metal construction

The adapter is all-metal, made of copper and aluminium alloy. Precise machining ensures a firm connection without play. The interior is coated with matte paint that absorbs stray light and reduces reflections and flare. The rim is knurled and finely CNC-machined, so the adapter sits firmly in your fingers when mounting and removing it.

Manual focus and aperture

The adapter has no electronic contacts and the camera does not recognise the lens – autofocus, aperture control from the body and lens data in EXIF do not work. Focus with the ring on the lens; magnification or focus peaking in the viewfinder makes precise focusing easier. The aperture is set with the aperture ring on the lens; lenses without an aperture ring cannot be stopped down with this adapter.

First use

Before the first shot, enable shutter release without a lens in the camera menu (on Sony “Release w/o Lens”, a similar option on other brands). Otherwise the body will not treat the adapter without contacts as an attached lens and will not release the shutter.

C-mount lenses

Lenses with the C thread come from 16mm film cameras and from industrial and security cameras and are designed for small sensors. On a larger sensor the corners will therefore vignette; a crop mode helps if the body offers one.

Compatible cameras

Canon EOS R3, R5, R5 C, R6, R6 Mark II, RP, R50, R100 and other bodies with the Canon RF mount.

• K&F Concept C-EOS R adapter

• Lens side: C-mount (1"-32 UN)
• Camera side: Canon RF
• Type: mechanical, no electronic contacts
• Focusing: manual
• Aperture: with the lens aperture ring
• Material: copper and aluminium alloy
• Interior: matte anti-reflection paint
• Designation: C-EOS R
• Order code: KF06.523