The Canon EF 85mm f/1.8 USM Lens is a fast medium-telephoto lens designed for Canon EOS full-frame and APS-C format DSLRs. The lens features a wide maximum aperture of f/1.8, which allows for excellent low-light performance and shallow depth of field effects, making it a popular choice for portrait, wedding, and event photography.

The lens uses Canon's Ultrasonic Motor (USM) technology for fast and accurate autofocus, as well as full-time manual focus override. The optical design of the lens consists of 9 elements in 7 groups, including a single UD (Ultra-low Dispersion) glass element to minimize chromatic aberrations and ensure high image quality. The lens also features Canon's Super Spectra coating to reduce flare and ghosting.

The lens has a minimum focusing distance of 2.8 feet (0.85 meters) and a maximum magnification of 0.13x, making it suitable for capturing portraits with a natural-looking perspective. The lens is also compact and lightweight, making it easy to carry around for extended periods of time. It measures 2.95 x 2.81 inches (75 x 71.5 mm) and weighs only 14.8 oz (420 g).

Overall, the Canon EF 85mm f/1.8 USM Lens is a versatile and high-performance lens that is popular among portrait photographers and those looking for a fast medium-telephoto lens at an affordable price point.

Benefits

A medium-telephoto lens, perfect for creative portraiture, indoor sports and low-light shooting
Fast 8-bladed maximum aperture for low light shooting and soft background blur
The in-built Ultra-Sonic Motor (USM) drives fast and quiet Auto Focus with optional full manual override
Lightweight and portable, weighing only 425 g
Prevent ghosting and flare with Super Spectra coatings
Compatible with all Canon DSLR cameras and EOS-M mirrorless cameras with an EF-EOS M Mount adapter