Canon RF 10-20mm f/4 L IS STM Full-Frame Lens for RF-Mount {Rear Gel}

Canon's full-frame rectilinear zoom starts at 10mm.

Getting rectilinear correction at 10mm on a full-frame sensor is not a given. Most ultra-wides either stop short of this focal length or produce fisheye distortion that requires heavy post-processing to straighten. The RF 10-20mm f/4 L IS STM covers 130° 25' at its widest end and holds straight lines without the barrel distortion that would otherwise make architecture unusable. The 16-element, 12-group design includes one Super UD element and three UD elements alongside three aspheric lenses, with Subwavelength Structure Coating and Air Sphere Coating working to keep ghosting in check against bright light sources.

At 570g and 112mm long, this lens sits comfortably on an EOS R body without front-heavy imbalance. The STM focus motor runs quietly enough for video work, and the optical image stabilization reaches up to 5.0 stops of correction on its own, or 6.0 stops when paired with an IBIS-equipped EOS R body. A rear gel filter slot handles the front-element curvature problem that makes traditional filter threads impossible at this focal length. Minimum focus distance of 9.8" at 25cm gives interior and detail shooters meaningful working room close to their subjects.

Who It's For

Architectural photographers shooting interiors where straight verticals are non-negotiable will find the rectilinear correction at 10mm does the structural work before any editing begins. Documentary and photojournalism shooters benefit from the 130° field of view in tight spaces where backing up isn't possible. Video operators gain from the STM motor's quiet operation and the coordinated IS system that keeps handheld footage stable without a rig. Landscape photographers working in constrained locations, rock formations, narrow canyons, or foreground-heavy compositions, get 10mm of full-frame coverage in a lens that weighs just over a pound.

Key Features

• 10-20mm rectilinear focal range with 130° 25' angle of view
• f/4 constant aperture throughout zoom range
• STM autofocus motor for silent video operation
• Optical image stabilization up to 5.0 stops, 6.0 with IBIS
• 16 elements in 12 groups with three aspheric lenses
• Rear gel filter slot eliminates traditional filter thread limitation
• 9.8" minimum focus distance for interior and detail work
• 570g weight optimized for full-frame mirrorless balance

FAQ

Does this lens produce fisheye distortion at 10mm?

No. The RF 10-20mm delivers rectilinear correction across its entire range, holding straight lines without barrel distortion. Most ultra-wides either stop short of 10mm or require heavy post-processing to correct fisheye output.

What's the optical image stabilization rated for?

Up to 5.0 stops of correction on its own. Pair it with an EOS R body equipped with IBIS and you get 6.0 stops of coordinated stabilization.

Can you use standard filters on this lens?

No. The front element curves too much for traditional screw-on filters. Instead, the lens has a rear gel filter slot to handle the geometry problem.

How close can you focus with this lens?

9.8 inches (25cm) minimum. That's close enough for interior and detail work without resorting to macro extensions.

Is the focus motor quiet for video?

Yes. The STM motor runs silently during video AF operation, which is exactly what you need for sound recording alongside footage.

How much does it weigh on an EOS R body?

570g (1.3 lb) at 112mm long. It balances well on mirrorless bodies without creating front-heavy imbalance.

What coatings reduce ghosting in bright light?

Subwavelength Structure Coating and Air Sphere Coating work together. The lens also includes one Super UD element and three UD elements to manage optical performance across the zoom range.