Lens Summary. Brand: Canon Also Known As: Canon 17-40mm f/4L. Lens Type: Zoom Lens Format: Full Frame / FX Focus: Autofocus Lens Mount: Canon EF Release Date: 2003-02-27. MSRP Price: $750 EF17-40mm F4L USM. 「EF20-35mm F3.5-4.5 USM」の上位機種として新たに開発されたもので、Lレンズの高画質と高いコストパフォーマンスの両立を実現している。. 新規光学設計の採用により、広角側17mm、望遠側40mmとそれぞれズーム域を拡大したほか、2種類・3枚の非 您当前在 首页 EF变焦镜头旧产品 EF 17-40mm f/4L USM EF 16-35mm f/2.8L II USM EF 17-40mm f/4L USM EF 24-70mm f/2.8L USM EF 24-105mm f/4L IS USM EF 24−105mm f/3.5-5.6 IS STM EF 28-135mm f/3.5-5.6 IS USM EF 70-200mm f/2.8L IS II USM EF 70-200mm f/2.8L IS USM EF 70-200mm f/2.8L USM EF 70-200mm f/4L IS USM This Canon 17-40mm L series professional lens offers a useful wide angle range with a constant aperture of f4. Released over 10 years ago this is one of the oldest lenses in the Canon line up. Canon EF lenses are compatible with all Canon DSLRs, but on an APS-C sensor camera it has its focal range multiplied by 1.6 (the sensor’s crop
has a silent focus motor built into the lens. Canon EF 17-40mm f/4L USM. Canon RF 14-35mm f/4L IS USM. 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.
Introduction Introduced in 2003 the EF 17-40 f/4L USM was one of the first of the lightweight pro-level L-series zooms from the firm adopting a constant f4 aperture. Not only does that make the lens relatively small and more portable compared with the f2.8 varients, but it also helps keep it moderately priced. Le zoom Canon 17-40 mm EF f/4L USM est un objectif ultra-grand-angle conçu pour les professionnels et les amateurs experts utilisateurs de reflex EOS. C'est à la foiszoom grand-angle pour les EOS argentiques (et l'EOS-1Ds) et un superbe zoom standard pour les EOS numériques dont le capteur est de format inférieur à 24x36 mm.

The EF17-40mm f/4L USM has 12 lens elements arranged in nine groups. Super Spectra coating ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over the complete 17-40mm zoom range the lens uses three aspheric elements. Super UD (Ultra-low Dispersion) glass prevents chromatic aberrations.

The Canon 16-35 F4L is sharper and has IS, and there are good also EF-S lenses like the Sigma 17-50 I would also suggest over the Canon 17-40. 16-35 F4 L IS is better for not much more money. I'd say it's a lot better but at least where I live it's also a lot more expensive.
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    • canon ef 17 40mm f 4l usm price