The Canon EF 100-300mm f/4.5-5.6 USM lens is a versatile telephoto zoom lens with a maximum aperture of f/5.6, ideal for capturing distant subjects with precision. This lens is designed for Canon EF mount cameras and offers both auto and manual focus options, along with zoom capabilities. Manufactured in Japan, this lightweight lens at 540g is a reliable choice for photographers looking for high-quality images and flexibility in their shooting options.