Canon EF 24-105mm ƒ/4L IS Sigma 24-105mm f/4 DG OS HSM Art User Reviews. lens against various zooms and primes at similar focal lengths at f/4, f/5.6 and f/8: Nikon 70-200 f4 at 105 mm, a John Riley reviews the new Canon RF 24-105mm f/4L IS USM, the standard kit lens for the EOS R. Used Canon EF 75-300mm f/4-5.6 III. Please add a full review of the Sony FE 24-105! Here you go: EF 24-105mm f/4L IS Strengths: This 4.4x constant aperture L-zoom lens provides close to the perfect focal length for event photography (e.g., weddings, receptions) as well as travel photography with a full frame camera. Sharpness and contrast are very good wide open at f/4, but improve if stopped down to f/5.6. On this review photographer Christopher Frost looks at two popular Canon zoom lenses the old and new EF 24-105mm f/4 to see what changed. The Canon EF 24-105mm f/4L IS USM has been around for a long time not just as a kit lens for some of Canon’s full frame cameras but also as a general purpose zoom lens. The newer Canon EF 24-105mm f/4 L IS zbek3fe.