| Field-test of the Canon EF 75-300mm
f/4-5.6 III zoom lens. The Canon EF 75-300mm f/4-5.6 III is, as suggested by its designation, the latest model in the EOS/EF lens line-up. Just like the Mk II version, the Mk III lens also has an Ultrasonic type in the form of the EF 75-300mm f/4-5.6 III USM (to be tested and reviewed next issue). Together, they form the lightest 4x telephoto zoom lenses available in their class. This lens is ideal for shooting sports, portraits, animals and candid photography. The telephoto effect can make the picture look compressed or have the excellent background blur. At the 300mm focal length, you can fill the frame with a postcard-sized item from 1.5 meters away. It has the same optical system construction as the EF 75-300mm f/4-5.6 III USM zoom lens, just minus the Ultrasonic Motor, using the Micro Motor version instead. With a filter size of only 58mm, the EF 75-300mm III lens is compact and lightweight, enabling handheld shooting without the need of a monopod even for action photography, compared to using single focal length lens like the EF 300mm f/2.8L USM (non-IS type). As for why Canon has created a Mach III version of this popular zoom lens, the answer lies in the new design of the optical system as well as the use of improved quality of lens elements that greatly reduce aberrations to a minimum plus increased AF speed for tracking moving subjects. Unlike most other budget-priced EF lenses, the EF 75-300mm III lens, like its previous editions, comes with a steel mount system rather than the plastic type that is common with most entry-level EOS products.
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