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Canon EF 70-300mm f/4-5.6 IS USM lens
Dennis Hissink : August 22th 2005 - 12:01 CET
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CanonCanon EF 70-300mm f/4-5.6 IS USM lens : Canon, a leader in photographic and imaging technology, today releases the Canon EF 70-300mm f/4-5.6 IS USM zoom lens. Featuring the latest 3-stop Image Stabilizer for outstanding camera shake reduction, the lens also features super responsive auto focus. Replacing the popular EF 75-300mm IS USM, the world’s first interchangeable lens with Image Stabilizer (IS), the lens is expected to appeal to serious amateur nature and sports photographers looking to achieve outstanding results while shooting hand held. IS dramatically reduces image blur caused by camera shake. The Canon EF 70-300mm f/4-5.6 IS USM lens features Canon’s latest 3-stop IS, a one-stop improvement over its predecessor.
Canon EF 70-300mm f/4-5.6 IS USM lensCanon digital SLR lens - Gyro sensor
This allows shutter speeds up to three stops slower than would otherwise be possible, with no perceptible increase in image blur. Photographers normally shooting a 300mm frame handheld at 1/500s can obtain the equivalent result with a shutter speed of just 1/60s, vastly extending options in low light conditions. 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.

Canon 70-300mm IS USM - Two Stabilizing modes
The EF 70-300mm f/4-5.6 IS USM provides 2-mode IS for shooting immobile subjects. Mode 1 stabilizes the image along both the horizontal and vertical axes. For shooting while panning to follow a moving subject, Mode 2 turns off correction in the panned direction and prevents the effect of dragging the subject back through the frame. IS switches off automatically when the camera is mounted on a tripod, thus preventing feedback loops between the IS sensor and stabilizer motor vibrations.

Canon 70-300mm lens - Superb auto-focus
The micro USM motor found in the EF 70-300mm f/4-5.6 IS USM employs ultra-sonic frequency vibrations to drive auto focus with unrivalled speed and near-silent operation. Good holding torque stops the lens with precision and accuracy, the instant it arrives at the correct focus point and without overshoot. A high speed CPU and optimised AF algorithm result in a significant increase of AF speed compared to that of its predecessor. A zoom ring locking mechanism is provided that locks the zoom at the wide-angle setting. This ensures that the lens is carried or stored in its most compact position, preventing possible damage caused by the lens extending and hitting obstacles when being carried mounted on a camera with a strap.

Canon digital SLR lens - Pleasing defocused background
The EF 70-300mm f/4-5.6 IS USM employs an electro magnetic diaphragm (EMD) with a circular aperture. This helps create an attractive, even defocused background when isolating a subject at large apertures. 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. Focal length translates to 112-480mm equivalent in 35mm film format when fitted to EOS 20D and EOS 350D cameras.

Canon EOS system lens - Accessories
The Canon EF 70-300mm f/4-5.6 IS USM includes distance metering information, providing compatibility with the E-TTL II flash system of late model cameras such as the Canon EOS-1D Mark II N and Canon 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. Accessories for the EF 70-300mm f/4-5.6 IS USM include the lens hood ET-65B and the lens pouch LP1222. In keeping with Canon’s Kyosei philosophy of living in harmony with the environment, the lens features only lead-free glass.

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