Canon EF 24–70mm lens
The Canon EF 24–70 mm lens is a family of professional EF mount wide-to-normal zoom lenses manufactured and sold by Canon. The first of the family, the EF 24–70 mm f/2.8L, was introduced in 2002 to replace the well-regarded 28–70mm f/2.8L. Two later versions were announced in 2012. The first of these, the EF 24–70 mm f/2.8L II, was announced by Canon in February, but would not ship to customers until September of that year. This lens replaced the Mk I, and had an MSRP of US$2299. The latest member of the family is the EF 24–70 mm f/4L IS USM, which was announced in November 2012 and expected to be available in December, however it only become available in January 2013. The f/4 version, which is the first of the family to include image stabilization, is the standard kit lens for the Canon EOS 6D.
Like its predecessor, the f/2.8 Mk I lens was often considered to have excellent contrast, color rendition and decent sharpness wide open. However, some samples of this lens have also been reported to exhibit deficiencies and operational problems not present in the older 28–70 mm lens, including poor sharpness and/or chromatic aberration. According to the head of a US lens rental firm, the f/2.8 Mk I lens "definitely has some reliability issues and a lot of copy-to-copy variation, at least some of which relate to its design."
Early reports on the f/2.8 Mk II indicated significant improvement in optical quality. The aforementioned rental firm head stated,
The resolution absolutely, positively kicks butt and takes names. It is way better than the lens it replaces. It’s better at 70 mm than the best Canon zoom I know of, the 70-200 f/2.8 IS II. It’s even better at 24 mm than the sharpest 24 mm prime we have, the Canon 24 TS-E. In the center, in the corners, it doesn’t care. We only had 5 copies to test, but they were all very similar with little copy-to-copy variation.
All versions of the lens include sealing against dust and water, although they are not waterproof. The f/2.8 Mk I includes an 8-bladed curved diaphragm, while both the f/2.8 Mk II and f/4 include a 9-bladed curved diaphragm. The diaphragm of the f/2.8 Mk I remains nearly circular from f/2.8 to f/5.6, according to the Canon Press release from 2002. Characteristic of zoom lenses, it exhibits some barrel distortion at its shortest focal length.
An unusual aspect of the f/2.8 Mk I lens (and the 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.
The f/2.8 Mk II lens, however, has a more conventional design, with the barrel extending as the focal length increases. The lens hood is much shorter than that of the Mk I version. The f/4 lens shares the same conventional design.
The f/2.8 versions are not true 1x macro lenses (1:1); the f/2.8 Mk I has a maximum magnification of only 0.29x and the f/2.8 Mk II has 0.21x. The f/4 lens, while also not a true macro lens, is considerably closer to being in that category. The f/4 has a switch-activated "macro" mode; at 70 mm, the maximum magnification is approximately 0.7x and the closest focusing distance is 20 cm.
|Attribute||f/2.8L USM||f/2.8L II USM||f/4L IS USM|
|Zoom Lock Lever||No||Yes|
|Construction||13 groups / 16 elements||13 groups / 18 elements||12 groups / 15 elements|
|# of diaphragm blades||8||9|
|Closest focusing distance||0.38 m / 1.25 ft||0.38 m / 1.25 ft (normal mode)
0.20 m / 0.66 ft (macro mode)
|Horizontal viewing angle||74°–29°|
|Diagonal viewing angle||84°–34°|
|Vertical viewing angle||53°–19°30'|
|Weight||950 g / 2.1 lb||805 g / 1.77 lb||600 g / 1.32 lb|
|Maximum diameter||83.2 mm / 3.3"||88.5 mm / 3.5"||83.4 mm / 3.3"|
|Length||123.5 mm / 4.9"||113 mm / 4.4"||93 mm / 3.7"|
|Release date||November 2002||September 2012||December 2012|
|Currently in production?||No||Yes|
- Canon EF 24–105mm lens, an L class lens with a similar but slightly longer focal length. It has a maximum aperture of f/4 and image stabilization, similar to the 24-70mm f/4L IS USM.
- Canon EF 70–200mm lens has both stabilized and non-stabilized versions with maximum apertures of 2.8 and 4.0, and continues the 24–70's maximum focal length through 200 mm
- Canon EF 24-70 f/2.8L II Announced « Canon Rumors. Canonrumors.com (2012-02-07). Retrieved on 2013-10-04.
- Canon EF 24-70 f/2.8L Version 1 vs Version 2 « Canon Rumors. Canonrumors.com (2012-02-07). Retrieved on 2013-10-04.
- Canon EF 24-70 f/2.8L II « Canon Rumors. Canonrumors.com (2012-02-06). Retrieved on 2013-10-04.
- "Canon EF 24–70 f/2.8L II Has Made its Way To Retailers". CanonRumors.com. 2 September 2012. Retrieved 12 September 2012.
- "Canon 24-70mm f/4 L IS, Full-Frame EF USM (2012-today)". 2012-11. Retrieved 2013-10-03.
- Westlake, Andy (2012-11-06). "Canon EF 24–70 mm f/4 L IS USM Preview". Digital Photography Review. Retrieved 2012-11-06.
- Sample crops
- FM reviews – Canon EF 24–70 mm f/2.8L USM
- Cicala, Roger (September 11, 2012). "Canon 24–70 f/2.8 II Resolution Tests". LensRentals.com. Retrieved September 12, 2012.
- Official Site: Canon EF 24–70 mm f/2.8L USM
- Canon Camera Museum: 24–70 mm f/2.8L
- Official Site: 24–70 mm f/4L Specifications
- 24–70 f/4L Canon press release
- 24–70 f2.8L Review by Digital Photography Review
- 24–70 f2.8L Review by DxOMark Labs