EF 24-105mm f4L IS USM
Canon press release
22 August 2005
Canon’s lightweight, Image Stabiliser zoom lens for professionals
Canon is pleased to announce the launch of its latest professional L-series lens: the lightweight EF 24-105mm f/4L IS USM with Image Stabiliser. Dust and moisture resistant and incorporating Canon’s very finest standards of precision optics, the EF 24-105mm f/4L IS USM is designed for reportage, event, travel and celebrity photographers looking for a lightweight and manoeuvrable lens with minimal image quality compromise.
Complementing the EF 17-40mm f/4L USM and EF 70-200mm f/4L USM, the lens completes Canon’s f/4L-series zoom lens range. These lenses are designed for professional photographers requiring a light zoom lens with a fixed aperture throughout the zoom range. For outstanding camera shake reduction, Image Stabiliser allows shutter speeds of 3 stops slower than would otherwise be possible, with no perceptible increase in image blur.
The L-series is Canon’s flagship professional lens range, designed to include outstanding image performance, ultimate operability and weather resistance. The EF 24-105mm f/4L IS USM offers a lightweight alternative to the renowned EF 24-70mm f/2.8L USM.
Image Stabiliser (IS) dramatically reduces image blur caused by camera shake. Gyro sensors detect unwanted vibrations, triggering the corresponding movement of a correcting lens group perpendicular to the optical axis. This alters the light path, returning the image to its correct position on the sensor or film plane.
The 3 stop advantage means that photographers normally shooting a 105mm lens handheld at 1/125 sec can obtain a shake free result with a shutter speed as low as 1/15 sec, for vastly extended options in low light conditions.
The ring-type USM motor found in the EF 24-105mm f/4L IS USM employs ultra-sonic frequency vibrations to drive auto focus with unrivalled speed and near-silent operation. A powerful CPU and improved AF algorithm contribute to speed performance. Good holding torque stops the lens with precision and accuracy, the instant it arrives at the correct focus point and without overshoot. Photographers can choose manual focus instantly and at any time simply by moving the manual focus ring without first having to switch out of auto focus mode.
Constant f/4 aperture from 24 to 105mm
The EF 24-105mm f/4L IS USM offers the highest possible optical quality with no change in aperture over the full focal range of the lens. This allows photographers to set exposure at the widest aperture and zoom all the way through to 105mm without having to vary the shutter speed. It is the perfect lens for professional photographers looking for a lightweight and extended zoom alternative to its EF 24-70mm f/2.8L USM counterpart. The lens employs an almost perfectly circular barrel aperture, helping create attractive, defocused backgrounds.
To limit lens size and improve image clarity over the total image area, an Ultra-Low Dispersion glass (UD) element is used to eliminate the secondary chromatic aberrations that otherwise reduce sharpness and introduce colour fringing. Aspherical lens elements correct spherical aberration for crisp, high contrast corner-to-corner quality. By optimising Super Spectra lens coatings and lens element shaping, Canon’s engineers have been effective in suppressing flare and ghosting – more prone to occur with digital cameras due to reflection off the image sensor. By increasing light absorption, coatings reduce reflections off lens element surfaces to deliver crisp, undistorted images with natural colour balance.
EOS system integration
The EF 24-105mm f/4L IS USM includes distance metering information, providing compatibility with the E-TTL II flash system of late model cameras such as the EOS-1D Mark II N and EOS 5D . When used in conjunction with Canon’s range of EX Speedlite flash units, the lens passes distance information to the flash algorithm for markedly improved flash exposure metering. To match the weather resistance afforded by EOS-1 professional camera bodies, an O-ring seals the lens against the lens mount and numerous seals around the lens’ moving components provide protection against the ingress of dust and moisture.
AF Mode and IS switches have been reshaped, making them less susceptible to being engaged or disengaged accidentally.
The EF 24-105mm f/4L IS USM comes with a bayonet mount lens hood EW-83H and soft lens pouch LP1219. In keeping with Canon’s Kyosei philosophy of living in harmony with the environment, the lens features only lead-free glass.
Price and availability
The EF 24-105mm f/4L IS USM will be available from September 2005 priced £869.00 RRP inc. VAT/ €1259.99 RRP inc. VAT.
Angle of view (horizontal, vertical, diagonal): 74° to 19° 20', 53° to 13º, 84° to 23° 20'
Lens construction (elements/groups): 18/13
No. of diaphragm blades: 8
Minimum aperture: 22
Closest focusing distance: 0.45 metre
Maximum magnification: 0.23x (at 105mm)
Distance information: Yes
Image stabilizer: 3-stops
AF actuator: Ring USM (mechanical full-time manual focusing built-in)
Filter diameter: 77mm
Max. diameter x length: 83.5 x 107mm
Magnification with Extension Tube EF12 II: 0.40x to 0.12x
Magnification with Extension Tube EF25 II: 0.61x to 0.27x (only compatible at tele)
Lens hood: EW-83H
Extenders EF1.4x II and EF2x II: Not compatible