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EF to RF Adapters

If you’re upgrading from a Canon DSLR to a new “R” mirrorless model (eg, Canon EOS R, RP, R5 or R6), you probably own at least a couple of EF or EF-S lenses. Unfortunately, these lenses aren’t directly compatible with the mirrorless RF lens mount, but they can be adapted using adapters.

Thankfully, there is a variety of EF to RF adapters offering different features and prices. Here they are at the time of this writing:


Adapter Model


Canon Mount Adapter EF-EOS R

Canon Control Ring Mount Adapter EF-EOS R

Canon EF-EOS R Drop-In Filter Lens Mount Adapter with Circular Polarizing Filter

Canon Drop-In Filter Mount Adapter EF-EOS R with Variable ND Filter

Viltrox EF-R2

Breakthrough Photography EF to RF Drop-In Adapter

Official Canon EF to RF Adapters

Canon currently offers four models of EF/EF-S to RF adapters. Each adapter will allow an EF or EF-S lens to function as expected on an RF mount mirrorless camera. Autofocus, image stabilization, electronic aperture, everything just works.

Canon Mount Adapter EF-EOS R

The basic adapter is the most affordable of the Canon line. No extra features or bells and whistles. The adapter simply allows an EF/EF-S lens to function.

Canon Control Ring Mount Adapter EF-EOS R

The Control Ring adapter is the same as the aforementioned adapter but it includes a control ring. This ring mimics the behavior of the programmable control ring found on RF lenses. By turning the ring you can increase/decrease exposure compensation, or assign your own custom function in-camera (eg, aperture, ISO, shutter speed, etc).

Canon EF-EOS R Drop-In Filter Lens Mount Adapters with Circular Polarizing / Variable Neutral Density Filters

These adapters are clever, for they include drop-in filters that sit behind the lens. Canon sells two models, one with a circular polarizer, the other a variable neutral density filter. By inserting a filter behind the lens, you may use a single filter with every EF/EF-S lens you own. No need to mount a filter on the front, which means no more step-up rings, filters of different diameters, etc.

Availability (December 2020)

Unfortunately, at the time of this writing, every Canon EF to RF Adapter is out-of-stock. There hasn’t been any available inventory for months because of manufacturing issues related to Covid-19. By the time you read this, Canon may have resolved the issue, but in the meantime be cautious when shopping online for there are a number of unscrupulous listings for used Canon adapters being sold at far higher prices than what they retail for brand new. (I found one listing on Amazon for $600 — yikes).

Third-Party EF to RF Adapters

Thankfully, there are other EF to RF adapters from companies besides Canon. Here are two adapters worth checking out.

Viltrox EF-R2 Adapter

The Viltrox EF-R2 adapter costs the same as Canon’s basic EF to RF adapter but it includes an RF control ring. This effectively makes the Viltrox adapter half the price of Canon’s similar model. I purchased two of these Viltrox adapters and have had no trouble mounting EF lenses or with communication between the lenses and my EOS R5. The adapter also includes a micro-USB port for upgrading adapter firmware.

Note: To make sure your EF or EF-S lens is supported by the Viltrox EF-R2, check out the official compatibility chart.

Breakthrough Photography EF to RF Drop-In Adapter

Breakthrough Photography has built a brand on exceptional neutral density filters and circular polarizers, so it makes perfect sense for them to offer their own drop-in filters. However, instead of manufacturing filters that fit Canon’s drop-in filter adapter, Breakthrough Photography is making their own. They even have a trade-in deal going on where you can mail in your Canon adapter for a discount.

The Breakthrough Photography adapter is compelling, for unlike the Canon adapters which offer two filter types (Circular Polarizer and Variable ND), the Breakthrough system is enormous. Solid NDs for photographers and filmmakers, dark circular polarizers, and even specialized filters for black-and-white and infrared photography. Whatever type of filter you want with your RF adapter, Breakthrough offers it.

Note: At the time of this writing, Breakthrough is accepting pre-orders for their RF adapter system. I’ve pre-ordered one and plan on reviewing it when it is released.


As you can see, there are plenty of options for using your EF and EF-S lenses on a Canon RF mount camera. Which adapter should you choose? Every adapter will work, but how much you invest should reflect how long you intend to use EF and EF-S lenses on your RF mount camera. The reason being, if you eventually start using native RF lenses, you will no longer need EF adapters. Also of note, Canon is continuing to manufacture existing EF lens models, but they’re not developing new ones (all efforts are with RF now), so a year or so down the road you may find yourself no longer needing an adapter.

For the time being however, all of these adapters are lifesavers for legacy Canon users with collections of EF glass.


I also covered this topic in a recent video on my YouTube channel. Check it out below.

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