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Zoom lenses are very convenient. The equivalent of two or more fixed focal length lenses in one unit. The maximum aperture of some zoom lenses changes as you alter the focal length, but through-the-lens (TTL) metering takes this into account to give correct exposure. Developed to succeed the EF75-300mm f/4-5.6 II this compact, lightweight high-magnification telephoto zoom lens covers medium telephoto 75 mm to super telephoto 300mm.