Product Review
Canon EF 70-300mm f/4-5.6 IS USM Lens features super responsive autofocus and has the latest 3-stop Image Stabilizer for outstanding camera shake reduction. The EF 70-300mm f4-5.6 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.
The EF 70-300mm f4-5.6 IS USM features Canon's latest 3-stop Image Stabilizer, a one-stop improvement over its predecessor. 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 1/500 second can obtain the equivalent result with a shutter speed of just 1/60 second, vastly extending options in low-light conditions.
It has a superb autofocus function. The micro USM motor found in the EF 70-300mm f4-5.6 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.
It also 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.
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