Sito italiano sulla natura e fotografia naturalistica Copyright   ©2002 ARDEA  riproduzione vietata, tutti i diritti della legge sui diritti d'autore

The new EF 24-70mm f2.8L USM lens - available November 2002 - is a successor to the EF 28-70mm f2.8L USM released in 1995.

This earlier lens has proved popular with professional and advanced amateur users as a high-performance standard zoom. However, with the rapid growth in popularity of digital EOS cameras, there has been a need for a standard zoom with a shorter wide-angle option to compensate for the smaller image format.

The EF 24-70mm f2.8L USM lens meets this need. It also offers the shortest minimum focusing distance in its class, and features enhanced water and dust resistance.

Features

• Uses two aspherical elements to give the wider 24-70mm zoom range while maintaining or improving on the image quality of the EF 28-70mm f2.8L USM
• UD element provides good compensation for the chromatic aberrations that tend to occur at short focal length settings
• Optimized lens coatings minimize the ghostings that sometimes arise when lenses are used with digital cameras
• High resistance to dust and water droplets
• Rear focusing and ring USM for near-silent and high-speed autofocusing
• High-speed autofocusing equal to or better than the EF 28-70mm f2.8L USM
• Near-circular aperture produces more attractive out-of-focus images (better bokeh)
• Minimum focusing distance of 0.38 metres at all focal lengths
• Front element does not rotate during focusing, allowing easy use of accessories such as polarizing filters
• Manual focusing enabled even during AF mode (full-time mechanical manual focus)
• Optical system constructed using only lead-free glass

The EF 24-70mm f2.8L USM lens comes standard with a lens hood (EW-83F) and a soft case and will be available in November 2002.

Specification

Focal length: 24-70mm

Aperture range: f2.8 to 22

Aperture blades: 8 (circular aperture)

Construction: 16 elements in 13 groups

Coating: Super Spectra

Filter mount: 77mm

Minimum focus: 0.38 metres

Maximum magnification: wide - 0.12x; tele - 0.29x

Minimum fields-of-view: wide - 212 x 322mm; tele - 83 x 122mm

Depth-of-field scale: none

AF drive: ring USM

Drive speed: 0.27 second (from infinity to minimum focusing distance)

Drive noise: 40 dB or lower

Focusing extension mechanism: rear focusing system with focusing cam

Rotating angle: 63 degrees

Manual focusing: enabled with focus mode switch and focusing ring (full-time mechanical manual focus)

Signal transmission:

• lens status
• lens type
• metering information
• focal length
• AF drive information

Extenders: not compatible

Extension tubes: compatible with EF12/EF25

Close-up lenses: 500/500D - compatible at long focal lengths; 250D - not compatible

Lens hood: EW-83F (petal form)

Lens cap: E-77U

Lens case: Soft case LP1219 (accommodates lens with one filter, hood in reverse, lens cap and dust cap)