| Canon EF 24-70mm f/2.8 L USM Specifications | |
| Frame Coverage | 35mm |
| Lens Construction (groups) | 13 |
| Lens Construction (elements) | 16 |
| No. of Diaphragm Blades | 8 |
| Minimum Aperture | 22 |
| Closest Focusing Distance | 0.38m (15") |
| Maximum Magnifcation | 0.29x |
| Filter Diameter | 77mm |
| Maximum Diameter x Length | 83.2mm x 123.5mm (3.3" x 4.9") |
| Weight | 950g (33.5oz) |
Reviews
Source
SailbyAir.com
Both lenses have their advantages, Sigma's mainly being price. The advantages need to be carefully weighed against their cost. I believe the Canon lens is the superior lens in practically all respects from image quality to build quality and features. That said, the Canon L lens costs three times as much as the affordable Sigma lens. As the aperture goes up, the differences between the two will go down.
Photo.net
Producing a high quality high speed zoom lens that goes as wide as 24mm is challenging, but the "L" in "Canon 24-70L" assures you of professional quality images, rugged construction, and substantial weather-proofing.
Colin Joye
The 24-70mm f/2.8L is arguably one of the best wide aperture zooms ever built. It has silent fast ring USM focus, a large 77mm front element, and a solid construction (and weight like a brick!).
Fred Miranda
The new 24-70L provides great image quality suitable to professional standards. However, if you are thinking of replacing your 28-70L or dumping your prime collection, think again. You may already have all you need.
Photo.net
Despite the fact that the "L" lens won in every comparison, I'm being pretty picky and I'm looking hard for faults. The Canon EF-S 18-55mm f/3.5-5.6 actually looks like a pretty decent lens for casual use, and at $100 it's probably a bargain.
William Castleman
The two expensive L-zoom lenses predictably outperformed the consumer quality EF 28-135mm lens on many tests. However, the differences in image quality that end up being visible in a print are surprisingly small.
Luminous-Landscape.com
The 24-105 has definitely taken its place in my bag, replacing the 24-70 as my general purpose medium focal length zoom.
Luminous-Landscape.com
Given that the old 28-70mm has long been considered a stellar performer — one of the most highly regarded mid-range fast zooms — to have it trumped so decisively by the new 24-70mm is quite a surprise.
