At 24mm, there will always be some form of corner shading. Canon EF 24-70mm f/4L IS USM User Reviews. 8.0/10 average of 1 review(s) Build Quality 9.0/10 Image Quality 8.0/10. The Canon EF 28mm f/2.8 USM IS and EF 35mm f/2 USM IS delivered pretty impressive results in our lab. Can the Canon EF 24mm f/2.8 USM IS continue this tradition ? Unfortunately it doesn't quite convince as much. The image quality is far from being bad in general but it could be clearly better at f/2.8 at least. The (old) Canon EF 28mm f/2.8 is a relic of the earliest days of EOS. This year it celebrated its 25th (!) year in production which is nothing short of amazing for an AF lens. However, 2012 is finally also the year of its successor - the Canon EF 28mm f/2.8 USM IS. As you may notice the focal length and speed remained the same but Canon added a ▸ Canon RF 70-200mm F2.8 L IS USM Lens Review ▸ Canon RF 70-200mm F2.8 L IS USM Lens Specifications and Measurements This independent review site earns affiliate commission (at no cost to you) when provided links are used to make any purchase Canon EF 11-24mm f/4L USM User Reviews. 9.0/10 average of 2 review(s) Build Quality 9.0/10 Image Quality 9.0/10. Write your own review! 9 out of 10 points and recommended by izzyinez (1 reviews) t3uWNi.