Product Highlights
  • F/4 - F/22 Aperture Range
  • 16 / 12 Elements / Groups
  • 9 Aperture Blades
  • STM Stepping Motor
  • OIS Optical Image Stabilization
  • Gelatin Filter Holder at Rear of Lens
  • RF Mount
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Canon RF 10-20mm F4 L IS STM Lens Canon RF 10-20mm F4 L IS STM Lens
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RF10-20mm F4 L IS STM Lens

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.

Key Features:

  • RF ultra-wide-angle lens for full-frame cameras
  • Incredible 10-20mm coverage for stills and video
  • Excellent image quality with 1 super UD lens, 3 UD lenses, 3 aspheric lenses
  • Subwavelength structure coating (SWC) and Air Sphere Coating (ASC) to reduce ghosting
  • Minimum focus distance of approx. 9.8 in./0.25m with a maximum magnification of 0.12x
  • Canon leadscrew-type STM (stepping motor) focus drive for smooth, quiet video AF operation
  • Optical image stabilization up to 5.0 stops of shake correction and up to 6.0 stops Coordinated IS when paired with EOS R series cameras featuring In-Body Image Stabilizer (IBIS)
  • Rear slot for pre-cut gel filters
  • Petal-type hood integrated into the lens barrel

In addition, this lens can achieve image stabilization correction of 6.0 CIPA standard stops with coordinated IS. The front lens element is coated in Fluorine for added durability, so you can easily wipe away oils and fingerprints. Canon SSC (Super Spectra Coating, and advanced ASC (Air Sphere Coating) and SWC (Subwavelength Structure Coating) technologies to help reduce flare, ghosting and other aberrations. The optical quality of this lens is impressive with 16 elements in 12 groups, including one super UD element, three UD glass elements, and three aspheric elements. This lens also has a minimum focus distance of just under 10 inches at all focal lengths.

What's Included

RF10-20mm F4 L IS STM Lens
Front Lens Cap
Rear Lens Cap


Product Specifications

RF10-20mm F4 L IS STM Lens

Focal Length 10-20mm
Maximum and Minimum Aperture f/4 - f/22
Lens Mount Type RF Mount
Compatible Cameras Canon EOS R-series, full-frame and APS-C (focal length equivelant to approx 16-32mm when used on an APS-C camera)
Minimum Focusing Distance 0.25m (9.8 in.)
Maximum Magnification 0.12x (at 20mm)
Field of View, at Minimum Focus Distance Approx. 520 × 347mm (20.5 x 13.7 in.) at 10mm; 284 x 189 (11.2 x 7.4 in.) at 20mm
Angle of View (Diagonal) Approx. 130° 25’– 94°

Optical Design

Lens Construction 16 elements in 12 groups
Special Elements 1 super UD lens, 3 UD lenses and 3 aspheric lenses
Lens Coating Canon SSC (Super Spectra Coating), SWC (Subwavelength structure coating), ASC (Air Sphere Coating), Fluorine coating.
Filter Size Diameter None (inserted in gelatin filter holder at the rear of the lens)
Aperture Blades 9
Image Stabilization 5.0 stops correction with In-lens Optical Image Stabilization (6.0 stops correction with EOS R series in-body coordinated Image stabilization)


Focusing Drive System Canon STM (Leadscrew type STM)
Full-time Manual Focusing Yes
(Supports both ONE SHOT AF and SERVO AF with compatible EOS R-series cameras)
Dual Pixel CMOS AF Coverage (Horizontal x Vertical) • 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)

Exterior Design

Control Ring Yes, with click stops
(click stops can be removed by a Canon service facility, for a fee)
Manual Focus Ring Electronic ring system
• Full-time Manual focus possible
• No physical limit to ring rotational angle
AF/MF Switch Yes; AF/MF
MF/Control Ring Switch No
Distance Scale None (Electronic distance scale possible in viewfinder or LCD monitor, with compatible EOS R-series cameras)
Distance Limiter Switch None
Dust / Weather Resistant Construction Yes

Physical Specs

Maximum Outer Diameter x Length Approx. ø83.7 x 112 mm (ø3.3 x 4.4")
Weight Approx. 570 g (20.1 oz.)

Questions & Answers

Canon RF 10-20mm F4 L IS STM Lens

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