Canon EF 70-200mm f/4L USM Lens Review
Another member of the Canon zoom lens F4-suite, the EF 70-200mm f/4L USM is a relatively compact size combines with low weight if the amount, if it contains the glass to be tested. Comprising 16 elements in 13 groups, this lens is a two Ultra-low Dispersion (UD) elements plus a low-dispersion fluorite element to minimize chromatic aberration.
Designed to connect to a moderate telephoto range with a natural perspective, makes the EF 70-200mm f/4L USM f4 its maximum aperture throughout the zoom range and focuses to 1.2 meters. It covers an angle of 10 degrees to 29 degrees and offers a magnification of 0.21 x close-up. This lens is an excellent partner for the EF 17-40mm lens review on the opposite side, although there is a 40-70mm gap, which is not covered.
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As with other lenses of the L-series EF 70-200mm f/4L USM for use in testing conditions and features rubber seals, designed for the entry of dust and moisture in all the moving parts and block the camera. The non-moving parts are buff with a coating that dressed the grip improved and reflects infrared rays, the optical system keeps cool in hot and sunny environment.
Inner focusing is used to secure the front lens does not rotate during focusing, making the lens suitable for use with angle-sensitive tools, such as polarizing filters, alumni and clip-on filter holder. A ring-type USM provides focus is fast, precise and quiet.
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The lens is measured with a focal length settings for 70, 100, 135 and 200mm focal length and a depth-of-field and AF MF switch provided engraved. The lens is supplied with a deep, cylindrical ET-74 lens hood, lens cap 67mm and rear dust cap, plus an LP1224 soft case.
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