Marketed	January 2023
Original Price	Open price
Lens Construction (group)	12
Lens Construction (element)	17
No. of Diaphragm Blades	9
Minimum Aperture	22
Closest Focusing Distance (m)	0.70
Maximum Magnification (x)	0.26
Filter Diameter (mm)	82
Maximum Diameter x Length (mm)	Approx. 89.2×130.3
Weight (g)	Approx. 935

With an optical configuration comprising 17 lens elements in 12 lens groups, including three UD lenses¹, the RF135mm F1.8 L IS USM helps mitigate all manner of aberrations that impair image quality, resulting in high image quality from the center to the periphery. In addition, a fast f/1.8 aperture make possible exquisite background blur effects and bring subjects and backgrounds closer together—a valuable attribute of medium-telephoto lenses—that enable users to capture portrait photos that make subjects stand out and create a sense of depth. What’s more, the adoption of a circular 9-blade aperture help render points of light in the background of images as beautiful blurred circles.

The RF135mm F1.8 L IS USM provides 5.5 stops² of image stabilization, and when paired with EOS R series cameras³, work in conjunction with the camera　to provide a total of 8.0 stops of IS (when used with the EOS R3, released in November 2021). As a result, the lens helps minimize camera shake even when during hand-held shooting in dark environments.

The new lens also features two “lens function buttons”, a first for Canon’s non-super-telephoto lenses. With default settings, they function as AF stop buttons. When a button is pressed while shooting with AF, users can temporarily disable AF and maintain a desired shooting distance and avoid AF“searching” as it follows a subject. What’s more, the lens is also equipped with a control ring to which users can assign such functions as exposure correction or aperture adjustment. Through the electronic viewfinder (EVF) of the attached camera, users can inspect post-capture images while operating the control ring, thus allowing for more comfortable and intuitive shooting.

1 UD: Ultra Low Dispersion lens elements
2 When used with the EOS R. Yaw/Pitch axes. Based on CIPA standards.
3 When used with the EOS R3. Yaw/Pitch axes. Based on CIPA standards.