Canon calls this the CANON ZOOM LENS EF 24-70mm f/2.8 L USM.
EF means “electronic focus,” meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF.
L only means as expensive as L; it means nothing technically.
USM means Ultra-Sonic Motor. This means autofocus is almost silent, and that you can grab the big focus ring for instant manual focus override at any time.
16 elements in 13 groups.
Internal focus: nothing moves externally as autofocused.
Two aspherical elements.
One UD glass element.
On 1.3x Canon cameras it will see angles-of-view similar to what a 30~90mm lens would see on a 35mm camera.
On 1.6x Canon cameras it will see angles-of-view similar to what a 38~115mm lens would see on a 35mm camera.
Angle of View (on 35mm and full-frame cameras)
84º – 34º diagonal.
53º – 19.5º vertical.
74º – 29º horizontal.
Close Focus top
1.25 feet (0.38m), specified, from the image plane.
Since this lens is so big, this actually means that it focuses to within about 8 inches (20 cm) of the front of the lens at the 70mm setting, and even closer as the lens gets longer at the wider settings.
Maximum Reproduction Ratio top
1:3.45, which is pretty close!
This lens MAY NOT be used with either of the Canon EF 1.4x II or Canon EF 2x IITeleconverters.
Use the Canon EF12 II to get close-ups to about half life-size at the image sensor.
Use the Canon EF25 II to get close-ups to about 3/4 life-size at the image sensor.
Use the Canon 500D to get close-ups at 70mm to about 4/10 life-size at the image sensor.
24-70mm f/2.8 wide-open at f/2.8 at 40mm. (EF diaphragm not visible). enlarge.
Reasonably round at large apertures, octagonal at small apertures.
Stops down to f/22.
Hard Infinity Focus Stop? top
You have to let the AF system focus for you at infinity.
Focus Scale top
The ring turns from infinity to the closest macro focus distance in about 120.º
Depth-of-Field Scale top
Infra-Red Focus Indices top
Yes, marks for 24mm, 28mm, 35mm, 50mm and 70mm focal length settings.
These marks are for the 800 nm wavelength.
Filter Thread top
Does not rotate and doesn’t move with focus, but does move in and out with zooming.
Canon specifies 3.28″ (83.2mm) diameter by 4.85″ (123.3mm) long, when set to 70mm.
It extends as zoomed to shorter focal lengths.
32.080 oz. (909.5g), measured.
Canon specifies 33.5 oz. (950g).
$50 plastic clip-on EW-83F, included.
$33 LP1219 sack, included.
Standard 77mm ET-77U front, included.
Standard EOS cap rear.
Photokina, 29 September 2002.
2012, by the 24-70mm L II.
Made in Japan.
Price, USA top
2012 September: about $1,400 used.
Since Canon’s replacement 24-70mm f/2.8 L II sells for $2,300 and does the same thing, needless to say, the price of this lens used is still the same as it was new.
2011 September: $1,400 new.
(220,000 Yen catalog price at introduction in 2002.)