Canon RF 50mm f/1.8 STM LensBeing bulky or inconvenient to carry is never a concern with the RF50mm f 1. 8 STM lens. Its compact size makes it appealing to bring on any trip or excursion and is quite handy to have around, too, with its 50mm fixed focal length letting you be creative with composition and because the 50mm focal length is similar to what the actual human eye sees, it provides a great representation to capture impressive portraits, landscapes, food photos and more.