Canon RF 10-20mm f/4 L IS STM Lens

The Canon RF 10-20mm f/4 L IS STM is an ultra-wide zoom built for landscape, architecture, interior, and nature photographers who need a wide field of view with L-series optical quality on a full-frame RF-mount body. Its constant f/4 aperture holds exposure steady across the zoom range, and Canon built it to work equally well for photo and video, pairing a quiet STM focus motor with a configurable Control Ring for on-lens exposure adjustments. It's a specialty lens for shooters who regularly need more width than a standard zoom provides.

• Ultra-wide constant aperture: A constant f/4 maximum aperture across the 10-20mm range keeps exposure and depth of field consistent throughout the zoom.
• Low-aberration optics: One Super UD element and three UD elements, plus three aspherical elements, minimize chromatic aberration, color fringing, and distortion.
• Flare-resistant coatings: ASC (Air Sphere Coating) and SWC (Subwavelength Structure Coating) reduce flare and ghosting for higher contrast and color accuracy.
• Dual-mode stabilization: Built-in Optical IS corrects up to 5 stops of shake, extending to 6 stops via Coordinated IS when paired with an EOS R-series body's IBIS.
• Video-friendly focus: A quiet, high-speed STM leadscrew focus system with full-time manual override suits both photo and video work.
• Weather-sealed L-series build: Sealed against dust and moisture, with a configurable Control Ring for adjusting aperture, ISO, or exposure compensation directly from the lens.
• Close-focusing: Minimum focus distance of just under 10" at every focal length, enabling unusually close ultra-wide shots.