Canon RF 135mm f/1.8 L IS USM Review

The Canon RF 135mm f/1.8 L IS USM is a premium telephoto prime that delivers exceptional optical performance for Canon's mirrorless RF mount. Weighing 935 grams and measuring 89.2 x 130.3mm, it's a substantial lens built to professional standards with weather sealing, a fluorine-coated front element, and Canon's L-series build quality. The lens features a fast f/1.8 maximum aperture paired with 9 rounded aperture blades, promising creamy bokeh for portraiture and event work.

Reviewers highlight the lens as one of the sharpest ever tested, with OpticalLimits calling it brutally sharp across all apertures. The optical design incorporates 17 elements in 12 groups, including three ultra-low dispersion elements and Canon's Air Sphere and Super Spectra coatings to control aberrations and flare. Image stabilization is robust at 5.5 stops solo or up to 8 stops when combined with in-body stabilization, making handheld shooting at 135mm far more practical. The Nano USM autofocus motor provides fast, quiet focusing down to 27.6 inches (0.26x magnification), and two programmable function buttons add control flexibility.

At $2,399 launch price (currently listed at $2,099), this is a flagship lens aimed squarely at professionals and serious enthusiasts who need cutting-edge sharpness and the versatility of image stabilization in a classic portrait focal length.