Canon RF 10-20mm f/4L IS STM review: the ultimate ultra-wide zoom

The Canon RF 10-20mm f/4L is the world's widest full-frame rectilinear lens with autofocus – and all-new stabilization tech

5 Star Rating
Photographer holding the Canon RF 10-20mm f/4L IS STM mounted to a Canon EOS R5

Digital Camera World Verdict

Canon's RF 10-20mm f/4L IS STM is a cutting-edge lens that reveals the benefits of the RF mount and pushes the envelope for ultra wide-angle zooms. When a company announces a 'world-first' it can often be a bit of a gimmick, but that's not the case here. Compared to its EF 11-24mm f/4 predecessor, the new lens is lighter, more portable, less expensive, and boasts a handful of actually useful upgrades (stabilization, Control Ring, custom button, STM) making it a no-brainer!


  • +

    Very portable and lightweight

  • +

    Perfectly balanced for gimbal & video

  • +

    Control Ring and custom button

  • +

    5-stop optical IS (up to 6 with IBIS)

  • +

    Super wide rectilinear angle of view


  • -

    Pricey (but cheaper than EF predecessor)

  • -

    Vignetteing in RAWs at 10mm

  • -

    No focus distance window

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    Difficult to use filters

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The Canon RF 10-20mm f/4L IS STM is the full-frame mirrorless successor to the Canon EF 11-24mm f/4L USM for DSLRs, which was launched back in 2015. 

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MountCanon RF
Effective focal length10-20mm (16-32mm APS-C)
Image stabilizer5 stops, or 6 stops with IBIS
Minimum focus distance0.25m
Manual focus overrideYes
Custom buttons1
Aperture blades9
Optical construction16 elements in 5 groups
FilterRear gelatine
Weather sealedYes
Supplied accessoriesSoft case
Dimension83.7x111 mm
Weight 570g

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Dan Mold
Deputy Editor

Deputy Editor on PhotoPlus: The Canon Magazine, Dan also brings his technical wizardry and editing skills to Digital Camera World. He has been writing about all aspects of photography for over 10 years, having previously served as technical writer and technical editor for Practical Photography magazine, as well as Photoshop editor on Digital Photo

Dan is an Adobe-certified Photoshop guru, making him officially a beast at post-processing – so he’s the perfect person to share tips and tricks both in-camera and in post. Able to shoot all genres, Dan provides news, techniques and tutorials on everything from portraits and landscapes to macro and wildlife, helping photographers get the most out of their cameras, lenses, filters, lighting, tripods, and, of course, editing software.

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