- 17-40mm ultra-wide-angle zoom lens with f/4 maximum aperture for Canon SLR cameras
- 3 aspherical lens elements and super UD glass element create superior optics in all conditions
- Powerful ring-type ultra-sonic monitor (USM) produces fast and silent autofocusing
- Focuses as close as 11 inches; supports screw-in 77mm filters or up to 3 gel filters
- Weather-resistant construction; measures 3.3 inches in diameter; 1-year warranty
Product Description
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. 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/… More >>
Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras
10:02 pm on October 2nd, 2009 1
This lens is really not meant for Canon Digital SLRs. The multiplying factor negates its wide angle capabilities.
Rating: 2 / 5
12:55 am on October 3rd, 2009 2
This is a great lens if you do not plan to use it with a built-in flash. I actually returned this lens because it casts a large shadow when used with the built in flash. If you don’t use flash or have an external flash you will love this lens – especially if you miss the full-frame in your canon digital…
Rating: 3 / 5
3:16 am on October 3rd, 2009 3
Hello Amazon,
Now that I have taken some pictures and compared them to my 18-55 USM lens that came as “standard” with my Canon EOS Rebel XTI, I see NO advantage or difference. I’m comparing by taking a picture, changing lenses, taking the same picture with the new “Ultra Wide Angle” USM lens that cost almost as much as my whole camera/lens/lens package, and see NO DIFFERENCE. Is this the wrong lens? The instruction manual makes no reference to “Ultra Wide Angle” anywhere. Please advise. Thank you. William
Rating: 1 / 5
5:33 am on October 3rd, 2009 4
I am frankly quite disappointed with the overall experience… coupled with the digital rebel xt, this $650 lens wont give you any more sharpness than the 50mm f/1.8 which runs at about $70. Further, at 17mm (27.2mm equivalent on the xt) the wide angle distortion is very visible…Also between 35-40mm, the lens’ transmitted contrast degrades very fast (look at the MTF charts on canon’s website). Further, in low light conditions, the f/4 isn’t very helpful…The UV filter runs at about $40. This $700 experience isn’t very pleasing. You don’t get what you pay for at all.
Rating: 3 / 5
7:52 am on October 3rd, 2009 5
A friend photographer for a local newspaper showed up with one of these, brand new! I tested it against the 28-40 range and the pictures were completely identical in every way, sharpness in every corner, contrast, etc.
Just thought I let you know.
Rating: 3 / 5