Canon EF 24–70mm lens

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Canon EF 24–70 f2.8L lens with hood (EW-83F)

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,[1][2][3] but would not ship to customers until September of that year.[4] This lens replaced the Mk I, and had an MSRP of US$2299 when introduced.[1] The latest member of the family is the EF 24–70 mm f/4L IS USM, which became available in January 2014.[5] The f/4 version, which is the first of the family to include image stabilization, was initially reported to be the standard kit lens for the Canon EOS 6D,[6] but as of December 2013 has yet to appear in 6D kits in most markets.

Like its predecessor, the f/2.8 Mk I lens was often considered to have excellent contrast, color rendition and decent sharpness wide open.[7] However, some samples of this lens have also been reported to exhibit deficiencies and operational problems[8] 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."[9]

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.[9]

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.

Reverse zoom[edit]

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.[9] The f/4 lens shares the same conventional design.

Macro[edit]

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.[6]

Specifications[edit]

Attribute f/2.8L USM f/2.8L II USM f/4L IS USM
Image Canon 24-70 mm F2.8 lens side at 70 mm.jpg Canon EF 24-70mm II.jpg Canon EF 24-70mm f4 IS.JPG
Key features
Full-frame compatible Yes
Image stabilizer No Yes
Environmental Sealing Yes
Ultrasonic Motor Yes
L-series Yes
Diffractive Optics No
Macro No Yes
Zoom Lock Lever No Yes
Technical data
Aperture (max-min) f/2.8–f/22 f/4.0–f/22
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)
Max. magnification 0.29x 0.21x 0.70x
Horizontal viewing angle 74°–29°
Diagonal viewing angle 84°–34°
Vertical viewing angle 53°–19°30'
Physical data
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"
Filter diameter 77mm 82mm 77mm
Accessories
Lens hood EW-83F EW-88C EW-83L
Retail information
Release date November 2002 September 2012 December 2012
Currently in production? No Yes
MSRP (US$) $1349.00 $2099.00 $999.00

See also[edit]

  • Canon EF 24–105mm lens, available in two versions—one an L class lens, and the other a consumer-level lens—with a similar but slightly longer focal length. The L version has a maximum aperture of f/4 and image stabilization, similar to the 24-70mm f/4L IS USM, but lacks that lens' macro feature. The consumer version is also image-stabilized, but replaces the USM motor drive with STM, has a variable maximum aperture, and also lacks a macro feature.
  • 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

References[edit]

  1. ^ a b Canon EF 24-70 f/2.8L II Announced « Canon Rumors. Canonrumors.com (2012-02-07). Retrieved on 2013-10-04.
  2. ^ Canon EF 24-70 f/2.8L Version 1 vs Version 2 « Canon Rumors. Canonrumors.com (2012-02-07). Retrieved on 2013-10-04.
  3. ^ Canon EF 24-70 f/2.8L II « Canon Rumors. Canonrumors.com (2012-02-06). Retrieved on 2013-10-04.
  4. ^ "Canon EF 24–70 f/2.8L II Has Made its Way To Retailers". CanonRumors.com. 2 September 2012. Retrieved 12 September 2012. 
  5. ^ "Canon 24-70mm f/4 L IS, Full-Frame EF USM (2012-today)". November 2012. Retrieved 2013-10-03. 
  6. ^ a b Westlake, Andy (2012-11-06). "Canon EF 24–70 mm f/4 L IS USM Preview". Digital Photography Review. Retrieved 2012-11-06. 
  7. ^ Sample crops
  8. ^ FM reviews – Canon EF 24–70 mm f/2.8L USM
  9. ^ a b c Cicala, Roger (September 11, 2012). "Canon 24–70 f/2.8 II Resolution Tests". LensRentals.com. Retrieved September 12, 2012. 

External links[edit]