Canon's "prosumer" zoom lens is (was) the Canon EF 17-40mm f/4 USM L which dates back to the film era. On paper it's certainly interesting regarding its comparatively long range and, maybe even more so, a fairly attractive pricing.
This means that you can make manual adjustments once the AF has finished, without changing to manual mode. has a silent focus motor built into the lens. Canon EF 17-40mm f/4L USM. Canon EF 24mm F/2.8 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.

Superior optical performance. 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

Buy this product as Renewed and save $340.01 off the current New price. Canon Advanced Two Lens Kit with 50mm f/1.4 and 17-40mm f/4L Lenses (Renewed) $838.99 & FREE Shipping. (2) Works and looks like new and backed by the Amazon Renewed Guarantee. For those working to a strict budget there’s the very respectable EF 17-40mm f/4 L USM, while for those who can justify the cost there’s the superb EF 16-35mm f/4L IS USM, which benefits from having a built-in optical image stabiliser – a feature Canon’s similarly excellent, but the EF 16-35mm f/2.8L II USM and EF 16-35mm f/2.8L III USM

In reply to eorlingas • Dec 23, 2006. Two stops is generally the case with consumer lenses but the Ls generally perform best wide open. For instance both my 400mm f/5.6L and 70-200mm f/2.8L are sharpest at maximum aperture. With the 17-40mm f/4L I find it is best f/4-5.6. eorlingas wrote:

Intro Images Analysis Technik Recommendations. Let's compare the sharpness of all current Canon ultrawide lenses, which are the Canon 20mm f/2.8 USM introduced in 1992, the 17-40mm f/4 L of 2003, the 16-35mm f/2.8 L II of 2007 and the newest 16-35mm f/4 L IS, introduced in 2014. The biggest difference among ultrawide lenses is how sharp they Re: Canon EOS 7D + Canon EF 17-40mm f/4 L USM or Canon EF-S 15-85mm f/3.5-5.6 IS USM In reply to Powerdoc • Apr 1, 2012 On my two crop bodies the 17-55 is much better than the 17-40L at 2.8 and at 55mm and the IS seems to be better on the 17-55. I'm going to buy EOS 20D and I think the Canon 17-40mm would be a nice lens for normal use even if f4 is not so attractive and 17-40 is pretty xpensive. I don't rely on extreme zoom like 17-85mm with poor f as 4-5,6 and according the quality the 17-40 "L" is better quality. In the market there is a Sigma 18-50mm F2.8 EX DC (Sigma makes good
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    • canon ef 17 40mm f 4l review