The EF 24–105mm f/4L IS USM is an EF mount wide-to-telephoto zoom lens. It was introduced by Canon in 2005 to complement the well-regarded 17–40mm f/4L USM and 70–200mm f/4L USM. How does a prime lens work? Explore the Canon Lens Finder and find the right RF lens for you. With these versatile lenses, you'll enjoy a wide range of applications, including landscape, travel, portrait with the convenience of a single lens. LJ6leiz.