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Canon EF 17-40mm f/4.0L USM Zoom Lens

This 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. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses.Three Aspheric Lenses1 Super Ultra-low Dispersion glass element Inner/Real FocusingFull-Time Manual FocusingCircular ApertureEF 17-40mm f/4.0L USM Zoom LensLens Case LP1319 Lens Hood EW-83E
Average Customer Rating:
5 / 5
5
 / 
5
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Rating Breakdown 1 review
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1 out of 1(100%)reviewers would recommend this product.
Customer Reviews for Canon EF 17-40mm f/4.0L USM Zoom Lens
Review 1 for Canon EF 17-40mm f/4.0L USM Zoom Lens
5 / 5
5 / 5
Great wide angle lense
PostedApril 14, 2011
BigKahuna
from Anaheim, CA
Age: 55-65
Gender: male
Features
4 / 5
4 / 5
Performance
5 / 5
5 / 5
Price/Value
5 / 5
5 / 5
Quality
5 / 5
5 / 5
Satisfaction
5 / 5
5 / 5
This is an extremely sharp lense. Thru live view mode, this lense produces images that are in focus. Too bad it's not a faster lense, due to the difficulty trying to focus on the subject in low light situations. Other than that, great lense!
Pros: Great for Video, Great Bokeh
Cons: Slow Auto-Focus
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