Alongside the launch of the new EOS R  full-frame mirrorless camera, Canon also unveiled a trio of EF lens adapters. These adapters will allow users of the 150 million EF and EF-S lenses in existence to attach them to the upcoming EOS R, and any future RF mount cameras without losing any functionality. Note that EF-S lenses are compatible with the adapters, but using one will put the EOS R camera automatically into a cropped mode to prevent vignetting from the small image circle of a lens that’s designed for APS-C and not full-frame.

Mount adapters are nothing new for mirrorless systems, but it’s nice to see Canon thinking outside the box and providing three variations on the adapters with some interesting features.

Canon Drop-In Filter Mount Adapter EF-EOS R

This adapter will sell for $299 with a circular polarizer, and $399 with a variable ND filter. Personally this is the most exciting of the three adapters, but unfortunately it will not be available until March 2019. With the CPL version of this adapter, you’ll be able to use a polarizer with Canon’s ultra wide 11-24mm lens! The bulbous front lens element prevents a standard screw-on filter from being used, but this adapter will place the polarizer between the rear of the lens and the RF mount! The Canon 11-24mm lens is one of my top two landscape photography lenses, so I’m very excited about this prospect.

Canon Control Ring Mount Adapter EF-EOS R

The lens control ring is a new user customizable feature of all RF lenses and RF mount cameras. Camera functions such as exposure compensation, ISO, aperture or shutter speed can be assigned to the ring, and the Control Ring Mount Adapter allows you to use this feature with EF lenses as well. The Control Ring adapter will cost $199.

Canon Mount Adapter EF-EOS R

No frills on this one, the Canon Mount Adapter EF-EOS R is just a simple adapter to allow EF lenses to work with EOS R cameras. Due to the lack of a mirror box on the EOS R cameras, EF lenses need to be moved forwards away from the sensor. Essentially this adapter is just simulating the existence of a mirror box. The adapter does not contain any optical elements so there will be no degradation in image quality. The EF-RF mount adapter will be $99.

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