Canon Extender RF 2x review: double your telephoto reach and close-up magnification

The Canon Extender RF 2x aims to give twice the telephoto power for select RF lenses with minimal loss of performance and image quality.

Canon Extender RF 2x
(Image: © Matthew Richards)

Digital Camera World Verdict

The Canon Extender RF 2x is one of the priciest teleconverters on the market but I love its build quality and performance. I’d love it even more if it was compatible with a couple of my favored lenses.


  • +

    2x boost in telephoto reach

  • +

    Twice the minimum magnification factor

  • +

    Excellent build quality and performance


  • -

    Incompatible with some popular lenses

  • -

    Pricey for a 2x teleconverter

  • -

    Typical 2 f/stops of aperture reduction

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The name is a giveaway and, as you’d expect, the Canon Extender RF 2x is designed for EOS R-system mirrorless Canon cameras and compatible RF-mount Canon telephoto lenses. It therefore builds on the reputation and performance prowess of the latest Canon Extender EF 2x III for DSLRS, which can also be used on EOS R cameras via an EF-EOS R mount adapter. It sets out to be one of the world’s best teleconverters, aimed at professional and enthusiast photographers.

The Canon Extender RF 2x is nicely compact small and won’t take up much room in your gadget bag. (Image credit: Matthew Richards)
Swipe to scroll horizontally
MountCanon RF
Lens construction9 elements in 5 groups
Focal length multiplier2.0x that of main lens
Aperture reduction2 f/stops
Minimum focus distanceSame as main lens
Maximum magnification2.0x that of main lens
Dimensions71.2 x 39.3mm
Canon Extender RF 1.4x

The Canon Extender RF 1.4x gives you a 1.4x telephoto boost instead of 2x but with just one f/stop of aperture reduction instead of two f/stops.


If you’re using Canon EF-mount telephoto lenses on a DSLR or an EOS-R camera via a mount adapter, buy the Canon Extender EF 2x III instead.

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Matthew Richards

Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! 

His expertise with equipment doesn’t end there, though. He is also an encyclopedia  when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. 

In an earlier life he was a broadcast engineer at the BBC, as well as a former editor of PC Guide.