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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 Supe…
The Canon EF 17-40mm f/4 USM L showed a very good to excellent performance in the lab as well as during the field tests. The lens exhibited very little vignetting and excellent resolution figures. On the downsode the level of distortions could haven been a little better at the wide-angle setting. Typical for most wide-angle zooms chromatic aberrations can be visible but the problem remains comparatively low. The quality of the construction is next to perfect. Read more
Weaknesses: Images are very soft at f/1.8 and f/2. At close focusing range, the lens is not as sharp and has poor microcontrast (see 50% MTF scores) compared to other lenses tested at 20mm. Some people may not like the slightly yellow cast in color images. Read more
This is an exceptionally good lens and deserves it reputation, finding its place in most camera bags of professionals using Canon gear. The slightly warm colours produced by Canon L glass and the good contrast and control of other elements required for a nice lens are all there. The results will not disappoint. With recent improvements in lens design however, at the very top end it is staring to look a little long in the tooth. Read more
Canon EF 17-40mm f/4L USM is probably one of the best ultra-wide zoom lenses available on the market. For APS-C type cameras, the lens looses its ultra-wide appeal but still remains a solid choice for serious amateurs. Given its relatively affordable price, outstanding construction and image quality, the lens is a great value for your money! Read more
Read the rest of this review if you like, or stop here and know that I bought a Canon 17-40mm f/4 L for myself after having it and a 16-35mm f/2.8 L on loan for a month. The 17-40mm f/4 L is a better, lighter and newer lens than the fatter and more expensive 16-35mm. (I still look forward to trying the even more expensive and heavier 16-35mm f/2.8 L II.) I'll forgo the wider view for an overall larger zoom range, more consistent optical performance and less weight. Read more
This lens has been with me through all. It is durable, it is versatile, its 4.0 does the job unless you are shooting in low light situations with a lot of action. The images are crisp, the range of tones (highlights, shadows, midtones) are more than the naked human eye can see. Try it, shoot a photo of the sky on a cloudy day and then look at the shot, youll be amazed at what the lens can do. Read more
I use this lens on a Rebel XT. This lens is a very, very well built, and solid product. I am very happy with it and recommend it highly. I compared the EF-S zooms with IS and for the same money I have this L series lens with a MUCH nicer build quality and razor sharp glass. It is slightly heavy, which I like, as it makes for easier hand holding. With the cropped digital sensor this lens provides excellent indoor and scenery range of view. There is zero distortion even at... Read more
I was in need of a lens to replace the 'Kit' lens that came with my Rebel XT, and found this lens was the one that fit the bill. I used it, and compared it in the field, to other canon lenses, and decided that this particular lens was what I needed. ... Read more
After buying my DigitalRebel I became increasingly frustrated with the wide angle "kit lense". The pictures were never sharp, and using the kit lense was a nightmare. When doing landscape, I often mount a polarizer and ND grad filter ontop of my lenses. With the kit lense, this means that anytime I wanted to focuse I had to turn all the filters on the lens thread (a disaster!). On my search for a better ultra-wide angle lense, I also considered the 12-24 mm lens from... Read more
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