| EF 24-70mm f/2.8L | |
| Key features | |
|---|---|
| Maker: | Canon |
| Image stabilization: | No |
| Ultrasonic motor: | Yes |
| Short back focus: | No |
| Macro capable: | Yes |
| Application: | Pro Standard Zoom |
| Technical data | |
| Type: | Zoom |
| Focal length: | 24-70mm |
| Frame coverage: | Full frame |
| Aperture (max/min): | f/2.8 - f/22 |
| Construction: | 13 groups / 16 elements |
| # Diaphragm blades: | 8 |
| Close focus distance: | 1.25ft / 380mm |
| Max. magnification: | 0.29 (at 70mm) |
| Physical | |
| Max. diameter: | 3.3 in / 83.2 mm |
| Max. length: | 4.9 in / 123.5 mm |
| Weight: | 2.1lbs / 950g |
| Filter diameter: | 77mm |
| Accessories | |
| Lens hood: | EW-83F |
| Angle of view | |
| Horizontal: | 74° – 29° |
| Vertical: | 53° – 19°30' |
| Diagonal: | 84° – 34° |
| History | |
| Introduced: | November 2002 |
| Retail info | |
| MSRP US$ | $1349.00 |
The EF 24-70mm f/2.8L is a professional EF mount wide-to-normal zoom lens. It was introduced by Canon in 2002 to replace the well-regarded 28-70mm f/2.8L.
Like its predecessor, this lens is often considered to have excellent contrast, color rendition and decent sharpness wide open [1]. However, some samples of this lens have also been reported to exhibit deficiencies and operational problems[1] not present in the older 28-70mm lens, including poor sharpness and/or chromatic aberration. Some reports suggest that the lens performs well only at certain apertures and focal lengths; others suggest that the lens back-focuses, primarily on DSLR cameras.
The lens includes sealing against dust and water, although it is not waterproof. It also includes an 8-bladed curved diaphragm which remains nearly circular from f/2.8 to f/5.6. Characteristic of zoom lenses, it exhibits some barrel distortion at its shortest focal length.
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An unusual aspect of the 24-70mm f/2.8L (and 28-70mm f/2.8L) is that its barrel extends as it zooms toward its shortest focal length. When used with the supplied lens hood, which attaches to a non-moving part of the lens, this extension results in a properly matched shade at every angle of view. Most zoom lens hoods are designed for only the widest angle of view, offering progressively inadequate shade at longer focal lengths.
This reverse zoom is illustrated with the following two pictures:
At the telephoto end (70 mm) the end of the lens is the most retracted providing the most shade protection from the lens hood. At the widest end (24 mm) the end of the lens is the most protruding providing the least shade protection from the lens hood.
This lens is not a true macro lens, as it has a maximum magnification of only 0.29x (1:3.5) and not 1x (1:1).
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