Canon 24-70 EF f/2.8L USM

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
Aperture Range - Wide / Long	f/2.8-22
Number of Aperture Blades	8
Rounded Aperture?
Weight
Manufacturer Specification Weight	33.5 oz
Size
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
Features
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
Focus
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”