Canon calls this the CANON ZOOM LENS EF 11-24mm f/4 L USM. EF means "electronic focus;" there is an autofocus motor inside the lens. L means as expensive as L. USM (Ultra-Sonic Motor) means that the focus motor operates reasonably silently. Optics top. Canon EF 11-24mm f/4L internal diagram. Aspherical, Super UD Glass, UD Glass and glass.

Canon EF 24-70mm f/2.8L II USM Lens. Sigma 70-200mm f/2.8 DG OS HSM Sports Lens for Canon EF. Canon EF 16-35mm f/4L IS USM Lens.

This better wide angle performance of the EF 24-70 comes at the cost of slightly lower 70mm MTF performance at wide aperture and slightly greater linear distortion and chromatic aberration. The EF 24-70mm f/2.8L is compared with the EF 24-105mm f/4L IS and the EF 28-135mm f/3.5-5.6 IS lenses here. One Laughing Gull moves another out of the way. 200mm f/4 1/2000s ISO 100. Fawn Picture. 200mm f/4.0 1/180s ISO 100. Watching the Waves Picture. A cute little girl in pig tails watches the surf. 159mm f/5.6 1/640s ISO 100. Pink Lily Picture. 200mm f/4.0 1/250s ISO 100. The RF 70-200mm f/4L IS extends significantly when zooming. The lens is just slightly longer than the RF 24-105mm f/4L IS, and is actually very slightly lighter than that lens. As a result, this lens will fit in most any bag with ease, and can be carried around without worrying about weight. kLMnU.
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  • canon ef 24 70 f 4l is usm review