Lifetime Review of the Canon EF 17-40mm f/4L USM Lens. The Canon EF 17-40mm f/4L USM Lens is a staple for most photographers. I purchased mine about 10 years ago, and I am about to retire it. I am Canon EF 24-70mm f/4L IS USM. The 24-70mm sample photographs are pretty standard. The slowest shutter speed used was 1/60 for the cactus shot, so the images don’t give us a very good sense of As an L-class lens with Canon's USM focusing technology, there aren't many lenses which will keep up with the focusing speed of the EF 70-200mm ƒ/2.8L IS II USM. It takes well less than a second 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. 24mm f/11.0 1/60s ISO 160. Baby Picture. 70mm f/8.0 1/180s ISO 100. Rose 5. Shining against the black background, this Rose invites a smell. 70mm f/16 1/200s ISO 100. Liriope Flower and Leaf Picture. A dew covered Liriope flower and leaf rise out of the lark bed below. The Canon EF 24-70mm f/2.8L II USM Lens is the best zoom lens of this type made. Period end of story. It is top of the mark. I wouldn't be with out it. The Canon EF 24-70mm f/2.8L II USM L and the Canon EF 70-200mm f/2.8L IS II USM Lenses go with me everywhere. If I have a camera in my hand most likely one of those is on it. News Reviews Articles Buying Guides Sample Images Videos Cameras Lenses Phones Printers Showcase Canon EF 24mm f/2.8 IS USM Samples. Canon RF 24-105mm F2.8 L The Bottom Line. The Canon RF 70-200mm F4 L IS USM is a compact zoom with quick focus and exquisite optics. Pros may still want a F2.8 zoom, but this is more than enough lens for most photographers. ea6RS.