TYTO-CARBON-Brushless-Gimbal-Camera-Rig

Canon EF 24-70mm f2.8L USM

Name

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.

Optics       top

16 elements in 13 groups.

Internal focus: nothing moves externally as autofocused.

Two aspherical elements.

One UD glass element.

Focal Length

24~70mm.

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!

Teleconverters

This lens MAY NOT be used with either of the Canon EF 1.4x II or Canon EF 2x IITeleconverters.

Extension Tubes

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.

Close-up Lenses

Use the Canon 500D to get close-ups at 70mm to about 4/10 life-size at the image sensor.

Diaphragm       top

Canon 24-70mm f/2.8 L

24-70mm f/2.8 wide-open at f/2.8 at 40mm. (EF diaphragm not visible). enlarge.

8 blades.

Reasonably round at large apertures, octagonal at small apertures.

Stops down to f/22.

Hard Infinity Focus Stop?        top

No.

You have to let the AF system focus for you at infinity.

Focus Scale       top

Yes.

The ring turns from infinity to the closest macro focus distance in about 120.º

Depth-of-Field Scale       top

No.

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

77mm.

Metal.

Does not rotate and doesn’t move with focus, but does move in and out with zooming.

Size       top

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.

Weight       top

32.080 oz. (909.5g), measured.

Canon specifies 33.5 oz. (950g).

Hood       top

$50 plastic clip-on EW-83F, included.

Case       top

$33 LP1219 sack, included.

Caps       top

Standard 77mm ET-77U front, included.

Standard EOS cap rear.

Introduced       top

Photokina, 29 September 2002.

Replaced       top

2012, by the 24-70mm L II.

Quality       top

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.)

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