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Review Summary
2025-05-03T20:00:00
Nice to have L quality wide angle glass when needed.
Swellhunter

2025-03-04T19:00:00
Superb. Lovely and precise - I am pleased I acquired this lens.
ExquisiteFacade

2024-12-29T22:46:56
Love this lens so much. Incredible quality and the fisheye aspect is super fun.
JAMIE P.
2024-12-02T19:00:00
Very nice lens for landscape and interior photography. Still experimenting to learn how best to use it.
EvaH

2024-09-20T20:00:00
On back order for long but luckily got it somewhere before the trips with no regret with the extra wide angle coverages. Excellent RF lens.
HC888

2024-09-16T20:00:00
Love the Canon RF 10-20 MM Lens. It has opened up an new area of wide angle distortion free photography that I've not experienced before. It is well constructed and quiet enough to use for Video with the Canon on Camera Mic.
Paul M.

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10-20mm
f/4 - f/22
Canon RF Mount
Full Frame
Canon EOS R-series, full-frame and APS-C (focal length equivalent to approx. 16-32mm when used on an APS-C camera)
9.8" (0.25m)
0.12x (at 20mm)
Approx. 20.5 x 13.7" (520 x 347mm) at 10mm; 11.2 x 7.4" (284 x 189mm) at 20mm
Approx. 130 Degree 25'- 94 Degree
16 elements in 12 groups
1 super UD lens, 3 UD lenses and 3 aspheric lenses
Canon SSC (Super Spectra Coating), SWC (Subwavelength structure coating), ASC (Air Sphere Coating), Fluorine coating.
None (inserted in gelatin filter holder at the rear of the lens)
9
5.0 stops correction with In-lens Optical Image Stabilization (6.0 stops correction with EOS R series in-body coordinated Image stabilization)
Canon STM (Leadscrew type STM)
Yes (Supports both One Shot AF and Servo AF with compatible EOS R-series cameras)
EOS R - Approx. 88% x 100%
EOS R5 - Approx. 90% x 100% (Approx. 100% x 100% when using face and tracking-priority)
EOS R7/R10 - Approx. 90% x 100% (approx. 100% x 100% when subject is detected, or with Whole Area AF active)
Yes, with click stops (click stops can be removed by a Canon service facility, for a fee)
Electronic ring system:
Full-time Manual focus possible
No physical limit to ring rotational angle
Yes; AF/ MF
No
None (Electronic distance scale possible in viewfinder or LCD monitor, with compatible EOS R-series cameras)
None
Yes
Maximum Outer: 3.3 x 4.4" (83.7 x 112mm) (Approx.)
1.3 lbs (570g) (Approx.)
The RF10-20mm F4 L IS STM is a unique ultra-wide-angle lens that gives you corrected, rectilinear coverage to an incredible 10mm with full-frame cameras. Great for still photography and videography, the 10mm ultra-wide-angle effect is outstanding for its dramatic look, lending visual drama to your landscape, interior, architecture, travel, and even photojournalism images. This lens features true L-Series quality with optical and digital corrections for distortion, and optical image stabilization (OIS) for better low-light performance, especially when shooting video. Autofocus is handled by a tried-and-true STM-type focus motor which actually allows the overall lens design to be more compact while still providing rapid AF and smooth focusing during video recording.
The design of this lens is geared toward getting the job done efficiently with light weight, fast focusing, image stabilization, and a programmable control ring. There is even a petal-type lens hood built right into the barrel of the lens.
Capturing images at 10mm is already pretty special, but to do it in a lens that is lighter and smaller than even our own EF11-24mm f/4 L USM is quite a feat. The RF mount design allows for the possibility of this wider-angle lens range and is also a key factor in the size and weight reduction of the lens. This also enables the addition of IS (image stabilization) in a lens that otherwise might not be able to have it.
Again, thanks to the Canon RF lens mount, the RF10-20mm F4 L IS STM lens offers great optical quality. Its optical design includes one super UD element, three UD elements and three aspheric elements (including large-diameter aspheric and UD aspheric elements) as well as Subwavelength structure coating (SWC) and Air Sphere Coating (ASC) to reduce ghosting. On top of that, this lens features the same dust- and water- resistance found on L-series lenses with seals around the Control ring, focus ring, zoom ring, operation panel, and lens mount.

The RF10-20mm F4 L IS STM lens has a lot of advantages and features when it comes to video. First, you can take full advantage of the 10mm focal length on full-frame cameras, and you can even shoot 4K 60p without crop mode. If you are shooting on an APS-C camera, you’ll have access to wider angles than you ever have before (coverage equivalent to a 16-32mm lens). Another video advantage is the fixed f/4 aperture, minimizing exposure changes while zooming.
For consistently sharp results, the RF10-20mm F4 L IS STM features built-in optical Image Stabilization, providing enhanced shake reduction for up to 5.0 stops of shake correction. When paired with an EOS R-series camera that has In-Body Image Stabilization (IBIS), the Coordinated IS allows for up to 6.0 stops of correction. Steady hand-held video, and incredibly sharp still images, are the benefits of this new RF ultra-wide-angle lens.

With any Canon EOS R-series camera, expect swift and positive autofocus. The STM leadscrew-type focus drive system is especially beneficial to video users, because of its combination of quiet operation and outstanding smoothness of focus changes during actual recording. And AF during still shooting is quick and equally quiet.

With a minimum focus distance of just under 10 inches you can capture some really incredible ultra-wide-angle close-ups for a look unlike anything else.