Verdict. The Canon EF 24-70mm f/4 USM L IS is a difficult being with a great technical performance and a worrisome focus characterstic. It is certainly capable of delivering a image quality that sometimes even surpasses its bigger in-house mate (EF 24-70mm f/2.8 USM L II). It is very sharp throughout the range with no significant weakness at Good and I can positively report that the tested sample had a decent centering quality this time. The Canon EF 24-70mm f/2.8 USM L II is certainly one of the more mainstream professional grade lenses in the Canon line up and it surely continues the sales success story of its predecessor. On full format DSLRs it's a fast standard zoom lens The Canon EF 24-70mm f/2.8 USM L is an impressive zoom lens upon first contact but it stayed somewhat short of the high expectations with respect to its optical characteristics. It can certainly produce sharp images if you know how to handle it but the pronounced field curvature at the wide end is a faux-pas which can often spoil the game. From the Manufacturer. EF 24-70mm f/2.8L II USM. Meeting the ever-increasing demands on image quality that digital photography brings, the redesigned EF 24-70mm f/2.8L II USM is the latest update to the acclaimed L-Series of EF optics, re-establishing a new standard for superb optics, high-end durable construction and performance in professional zoom lenses. Canon EF 24-70mm f/2.8 L II USM Sample Images. Ahead of our full review, here are 32 sample JPEG photos taken with the Canon EF 24-70mm f/2.8 L II USM lens, mounted on a Canon EOS 5D Mk III. The Canon EF 24-70mm f/2.8 L II USM is a premium constant-aperture standard zoom lens for full-frame DSLR cameras, retailing for £2299.99 / $2299.99. The Sigma 28-70mm f/2.8 EX DG Lens features a fast, fixed 9-blade aperture ranging from f/2.8 to f/22. Again, you probably will want to avoid f/2.8 over most of the focal length range. A 67mm filter diameter keeps the Sigma 28-70's objective end reasonably small. Not many lenses share this filter diameter (the Canon EF 70-200mm f/4 L USM Lens I'd get my RF 24-105L IS USM at Adorama, at Amazon, at B&H or at Crutchfield, or used at eBay if you know How to Win at eBay. Name. Canon calls this the Canon Lens RF24-105mm f/4 L IS USM. RF: Works only on Canon's EOS-R full-frame mirrorless cameras. L: Expensive as L. IS: Image Stabilization. USM: Ultrasonic Autofocus Motor. Optics Canon calls this the RF135mm f/1.8 L IS USM: RF: Works only on Canon's EOS-R Mirrorless cameras. L: Expensive as L. IS: Image Stabilization. USM: UltraSonic (autofocus) Motor. Optics specifications top. Canon RF 135mm f/1.8 L IS USM Internal Optical Construction. UD elements. IS section. 17 elements in 12 groups. News Reviews Articles Buying Guides Sample Images Videos Cameras Lenses Phones Printers Showcase Forums Canon EF 24-70mm f/2.8L USM Specs. Announced Sep 29, 2002 In this video I test out the RF 24-70 2.8 on a Photoshoot with my friend Amanda! I also share some of my thoughts on the performance in the real world – sort SCnUG6.