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Rent NowThe Canon RF 45mm f/1.2 STM is a compact, affordable full-frame prime lens designed for Canon’s RF-mount mirrorless cameras, bringing an ultra-fast f/1.2 maximum aperture to photographers at an accessible price point previously reserved for Canon’s pricier L-series optics. It’s Canon’s first non-professional f/1.2 RF lens, well suited to portraits, lifestyle photography, and low-light shooting where a versatile standard focal length and strong background separation matter.
Optically, the lens offers a 45mm focal length with a maximum aperture of f/1.2 narrowing to f/16, delivering a 51°20′ angle of view. The 9-element, 7-group optical design includes one aspherical element to reduce spherical aberrations and distortion for sharp, accurate rendering, along with Canon’s Super Spectra coating to help control flare and ghosting. A 9-blade circular diaphragm contributes to smooth, expressive bokeh, and the lens is compatible with Canon’s focus breathing correction technology for cleaner focus pulls during video.
Autofocus is handled by a gear-type STM (stepping motor), delivering quiet, smooth autofocus performance well suited to both stills and video work, though it does not offer full-time manual focus override. A customizable control ring allows intuitive, direct adjustment of settings such as shutter speed, aperture, or ISO from the lens barrel itself.
Build quality uses a lightweight polycarbonate barrel with a metal mount, keeping the lens compact and portable at approximately 346g (12.2 oz.) and measuring 78 x 75mm (3.1 x 3.0 in.), among the lightest and smallest lenses in Canon’s f/1.2 lineup. It has a minimum focusing distance of 1.5 ft. (0.45m), yielding a maximum magnification of 0.13x (1:7.7 macro reproduction ratio), and accepts a 67mm filter thread. The lens is not dust- or moisture-resistant, does not include image stabilization, and is not compatible with Canon’s extenders.
As a full-frame RF-mount lens, the RF 45mm f/1.2 STM delivers its full angle of view on Canon full-frame RF-mount bodies while remaining compatible with Canon APS-C RF-mount cameras at a narrower, telephoto-equivalent effective field of view.
Key Features
– 45mm f/1.2 standard prime lens for Canon RF mount
– 9 elements in 7 groups, including 1 aspherical element
– Super Spectra coating
– Gear-type STM autofocus (no full-time manual focus override)
– Customizable control ring
– 9-blade circular diaphragm
– Compatible with focus breathing correction technology
– Minimum focusing distance of 1.5 ft. (0.45m); 0.13x maximum magnification
– 67mm filter thread
– No image stabilization; not dust- or moisture-resistant
– Not compatible with Canon extenders
– Lightweight polycarbonate barrel with metal mount (approximately 346g)
– Compatible with Canon full-frame and APS-C RF-mount cameras
