The Canon 70-200mm zoom lens is a great tool for many types of photograhy. With such an extensive zoom range, anything is possible from wedding photography to sports, wildlife, and even portrait photography from a distance. The inner-focusing system on the 70-200mm L USM lens makes sure that each photo is clear and in-focus the first time you shoot it. The 70-200mm paired with your Canon DSLR camera means possibilities are endless.
The Canon EF 70-200mm f/4 L USM is a proffesional grade telephoto zoom lens. Designed to deliver top quality images without as much bulk, weight or expense as a comparable f/2.8 zoom would require the 70-200mm f/4 L USM gives demanding photographers another option; a Pro's choice no longer needs to be between a 3 pound pro tele zoom and the disapppointment of a lesser quality lens.
Being an L series lens maximum attention was been given to sharpness, color reproduction, & bokeh by the designers. The heart of the lens is an optical system consisting of 16 elements in 13 groups; Two Ultra Low Dispersion UD glass elements and one Flourite glass element are strategically placed to maximize image quality. All lens elements are free of lead.
The constant f/4 maximum aperture allows reasonable background blur and with advancements in camera ISO noise levels, fast shutter speeds are getting easier to find. Weighing in at just over pound and a half, user fatigue is lessened and hand held photography becomes easier. A rotating lens tripod mount is available as a seperate accessory and greatly aids vertical shooting from either a tripod or monopod.
Portrait Photographers, sports photographers, pet photographers, wedding photographers, photojournalists, wildlife photographer, other action photographers and nearly everyone else wants fast autofocus and Canon delivers it with an internal focus system connected to a ring type Ultrasonic Motor. The focus mechanism is designed to provide the photographer the option of instant manual focus override without touching the lens AF control button, manual focus override works full time (even without power to the lens). The zoom and focus grips have different patterns and widths to aid tactile differentiation. A focus limit switch allows selection of a narrower 3 meters to infinity focus range to significantly reduce autofocus time as closer focussing distances occupy an amount of focus travel that is proportionally much greater than in farther focus distances. The full focus range of the lens is 1.2 meters to infinity.
While compatible with Canon L Series EF 1.4x and EF 2x tele extenders, autofocus points need to be sensitive to an effcetive aperture of f/8 to work with a 2x teleconverter combined with an f/4 lens.