Canon has released a 0.71x EF to RF speed booster adapter

Sep 24, 2020

John Aldred

John Aldred is a photographer with over 20 years of experience in the portrait and commercial worlds. He is based in Scotland and has been an early adopter – and occasional beta tester – of almost every digital imaging technology in that time. As well as his creative visual work, John uses 3D printing, electronics and programming to create his own photography and filmmaking tools and consults for a number of brands across the industry.

Canon has released a 0.71x EF to RF speed booster adapter

Sep 24, 2020

John Aldred

John Aldred is a photographer with over 20 years of experience in the portrait and commercial worlds. He is based in Scotland and has been an early adopter – and occasional beta tester – of almost every digital imaging technology in that time. As well as his creative visual work, John uses 3D printing, electronics and programming to create his own photography and filmmaking tools and consults for a number of brands across the industry.

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Canon has announced a new EF to RF 0.71x speed booster adapter. Like the speed boosters from Metabones and similar items from Viltrox and others, it allows you to use lenses designed for a larger sensor on a camera with a smaller sensor while retaining a wider field of view and, as the name suggests, effectively increasing the light transmission.

The release coincides with the launch of the new Canon EOS C70 cinema camera, but could it add more fuel to the rumours that Canon is planning to ditch the EOS M camera system in favour of APS-C EOS R RF mount cameras?

The description for the Canon EF-EOS R 0.71x mount adapter does specifically say that it’s “intended for cameras featuring a Super35 sensor size” and essentially reduces the effects of full-frame lenses down to a Super35 crop factor, increasing maximum aperture performance by one stop. It features electrical contacts, like Canon’s other EF to RF mount adapters, allowing you to retain metadata information and take advantage of Canon’s Dual Pixel AF.

Priced at $599, it’s certainly not an inexpensive item. Much like the Metabones Speed Boosters, it’s an item designed for optimum performance for demanding filmmakers. And a locking collar is included to provide a more secure bolt-on attachment to the EOS C70 camera body. But might this be Canon testing the waters to see if people are willing to accept an APS-C RF mount mirrorless camera?

It would be a shame to see the EOS M system disappear, especially after Canon has repeatedly said that it won’t. But the rumours of exactly that seem to be coming more frequently of late, with rumours of an upcoming APS-C RF mount mirrorless camera coming just as often.

The Canon EF-EOS R 0.71x Mount Adapter is available to pre-order now for $599. It’s expected to start shipping in late November

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John Aldred

John Aldred

John Aldred is a photographer with over 20 years of experience in the portrait and commercial worlds. He is based in Scotland and has been an early adopter – and occasional beta tester – of almost every digital imaging technology in that time. As well as his creative visual work, John uses 3D printing, electronics and programming to create his own photography and filmmaking tools and consults for a number of brands across the industry.

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4 responses to “Canon has released a 0.71x EF to RF speed booster adapter”

  1. Frank Hermann Avatar
    Frank Hermann

    Does it also work with a fullframe RF Camera or is only for APS-C RF Mount?

    1. John Aldred Avatar
      John Aldred

      From what I understand, it does physically fit on any RF mount camera, although Canon has intentionally blocked it from working on their EOS R RF mount mirrorless cameras.

      There probably wouldn’t be much point using it on a full-frame camera, though. Whatever lens you put on it would only be projecting onto an APS-C sized portion of the sensor anyway.

      1. Bao Nguyen Avatar
        Bao Nguyen

        Using the adapter on the EOS R does make a lot of sense for people who use that camera for 4k video work as it would help reduce the 1.7x crop factor down to 1.2x. EOS R is surprisingly good 4k video camera if you pair it with Atomos Ninja V for the 422 10 bit Clog output.

        I just hope that Canon allows it so I could use first party adapter than have to use the Metabones one.

    2. Frank Hermann Avatar
      Frank Hermann

      John Aldred ah ok. But at least it could be a nice Speedbooster on a Full-Frame if you Crop the image to APS-C. But not the ideal Solution.