Canon 24-70 EF f/2.8L USM

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Focal Length: 24-70mm
T-Stop: T2.8
Minimum Focus: 1.25ft
Front Diameter: 77mm
Weight: 2.1lbs

The Canon EF 24-70mm f/2.8 L USM Lens is a very high quality, Sharp Lens worthy of its L Series designation. Few zoom lenses reach this level of sharpness. The 24-70 L is sharp in the center at f/2.8 at all focal lengths and performs very well in the corners.

The wide open 24mm corners are most-affected by vignetting. Vignetting is very well controlled, but apparent in the corners at f/2.8 at 24mm on a full frame body. Vignetting improves as the focal length increases and the aperture is narrowed. At comparable apertures, the 24-70 L shows less vignetting than the also-excellent Canon EF 24-105mm f/4 L IS USM Lens - a typically-expected result when comparing a fast lens to a slower lens. 
Image quality is not the only pro-grade feature of the Canon EF 24-70mm f/2.8 L USM Lens. Excellent AF is part of the equation. A Ring USM (Ultrasonic Motor) AF system delivers quiet,fast and accurate autofocus. The 24-70 L's f/2.8 aperture enables the enhanced-sensitivity of many Canon EOS DSLR body's AF points. As usual for a Ring USM AF system, FTM (Full-Time Manual) focusing is enabled. The 24-70 L does not extend with focus and the 77mm filter ring does not rotate. 
Specifications Canon EF 24-70mm f/2.8 L USM Lens
Focal Length Range 24-70mm  
Angle of View: Diagonal 84° – 34°  
Angle of View: Horizontal 74° – 29°  
Angle of View: Vertical 53° – 19°30'  
Lenses / Groups 16/13  
Aperture Range - Wide / Long f/2.8-22  
Number of Aperture Blades 8  
Rounded Aperture?    
Manufacturer Specification Weight 33.5 oz  
Manufacturer Spec Size (DxL) 3.27 x 4.88”  
Measured Size (DxL) 3.37 x 5.13”  
Max Length at Full Extension 6.47”  
Internal Zoom? / Extends with Zoom? N / Y  
Zoom Extension Length 1.33”  
Internal Focusing? / Extends with Focusing? Y / N  
Lens Hood Size (DxL) 4.24 x 3.34”  
Lens Length with Hood (Min / Max) 7.56 / 7.56”  
Size of Rings - Zoom / Focus 0.93” / 0.91”  
Filter Size 77mm  
Front Element (Filter Mount) Rotates N  
Tripod Ring Included? / Removable? N  
Zoom Ring Lock Switch? N  
Lens Hood Model / Included? EW-83F / Y  
Weather Sealed? / Filter Required? Y / Y  
Image Stabilization? / Stops? / Tripod Sensing? N  
Case Included? / Type? Y / LP1219  
AF Motor Type Ring USM  
Full Time Manual Focus Y  
Focus Limiter? / Focus Limiter Ranges N  
Distance Info Provided to Camera? Y  
Distance Scale? / Type Y / Window  
Extender Compatible? N  
Close Focus    
Specified Min Focus Distance 15”