Pros Ultra-wide field of view. Reasonable price tag. Good center sharpness. Cons Muddy edges and corners at 17mm. Some distortion. Noticeable color fringing. The Canon EF 17-40mm f/4L USM Its IQ is quite good especially you stop down. Canon is due to upgrade both lenses especially 17-40L as Nikon did. Nikon relative new 16-35/4.0 VR IQ beats both Canon lenses at f/4 and it has VR. Also this 17-40L is pretty sharp on my 60D that actually slightly edge out Sigma 17-50/2.8 OS at f/4.0.

Lens Reviews / Canon Lenses i Lab tested. Lens Review; Specifications; Lens Review Specifications Lens Specifications; Name: Canon EF 17-40mm f/4L USM: Image Circle: 35mm: Type: Wide Zoom

Read Our Canon EF 17-40mm f/4L USM Review The lens has a single control switch, which is a toggle to change between automatic and manual focus. The zoom ring sits at the base of the lens and Review. 1. Introducción. El EF 17-40mm f/4L es un objetivo de gama alta, perteneciente a la serie L, que se vende a un precio razonable para todo lo que ofrece, de ahí su popularidad. Se trata de un zoom que funciona como súper gran angular en su focal de 17 mm y cubre una distancia media a 40 mm. Su interesante versatilidad le hace adecuado
Has full-time manual focus. Canon EF 17-40mm f/4L USM. Canon EF-S 18-135mm f/3.5-5.6 IS USM. With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode.
This item Canon EF 17-40 mm f/4.0 L USM Ultra-Wide Angle Canon EF Zoom Lens - Black Canon telephoto lens EF 75-300mm F4.0-5.6 III for EOS (58mm filter thread, autofocus) black Canon 344B006 EF 24-105mm f/4.0 L IS USM Lens (Renewed)

has a silent focus motor built into the lens. Canon EF 17-40mm f/4L USM. Tamron 28-75mm f/2.8 Di III RXD. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.

Product description from Canon. At launch 2003 Canon wrote this regarding Canon EF 17-40mm F4 L USM : "A new and affordable L-series ultra-wide-angle zoom lens that´s ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Of course the 16-35mm f/2.8 and 17-40mm f/4 work great on the 1.6x sensor cameras, but for those cameras the 18-55mm EF-S lens, for one fifteenth the price, is lighter and more agile. None of these is wide on a 1.6x camera. Even this 16-35mm on a 1.6x camera only covers a range similar to what a 26-57mm lens would on a 35mm film camera.

The EF 17-40mm f/4L USM lens is a member of a suite of Canon zoom lenses that retain a constant f4 maximum aperture throughout the zoom range. Designed for use on 35mm SLR cameras, this ultra-wide zoom is ideal for capturing dramatic landscape shots and taking portraits of large groups of people. It will also prove useful for shooting in cramped interiors. [ia]

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    • canon ef 17 40mm f 4l review