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EF 17-40mm f/4L USM ultra-wide-angle zoom lens * compatible with Canon EOS SLR cameras * Canon L Series lens with three aspherical elements and one Super UD (Ultra-low Dispersion) element for superior image quality * available full-time manual focusing * weather- and dust-resistant construction * ring-type Ultrasonic Motor for fast, silent autofocus * built-in gelatin filter holder * minimum aperture: f/22 * minimum focus distance: 11 inches * constructed of 12 elements in 9 groups *
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Technical Details
- 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
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By P. VANDALEN
If you're shooting an APS-C Canon and you've decided that you only want EF full-frame lenses for future use on a full frame camera, the 17-40 is a must-have. The focal range on the cropped sensor is 27 to 64mm which covers a large range for the majority of shots most people are likely to take. I've found this lens is perfect for social gatherings and essential for group shots. The size and weight is perfect on the 7D, making this my favorite lens for handling (compared to the 24-70 f2.8L and the 70-200 f4L). The build quality is superb. The focus and zoom rings couldn't be smoother and AF is fast. While this is a sealed lens, I hear that it's not fully sealed until a filter is fitted. With one in place, the zoom extension is completely internal, so there's no change in length when zooming from wide to the long end.
This lens is a fixed f4. If you buy the lens with the understanding it is not an f2.8 and will not get you the lower ISO and/or faster shutter speed of an f2.8, the lens does very well in most shooting situations. On the 7D it's even better with the excellent high-ISO performance of that camera (I can shoot at ISO 3200 to 5000 without much concern). While it is reasonably sharp at f4 across the focal range, it is not as sharp as when stopped down to f5.6. Also, boarder sharpness falls-off a bit wide open and close to 40mm. However, these are not big issues. Contrast and color with this lens is excellent. My only caution from experience is to be careful when adjusting the point-of-focus to depth-of-field balance with the micro AF adjust on the camera (if you have that feature). What may appear to be a correct adjustment with a focus scale sheet that uses the center of the field, may end up causing excessive edge softness of your images due to the edge of the frame starting to fall out of the depth of field. I believe this may be due to the field curvature characteristic of a wide angle lens where the focal plane is not equidistant from the camera lens but slightly curved. I spent some time setting the correct AF micro adjustment by photographing a large bulletin board with very small lettering and symbols across both dimensions while making sure the camera was pointed square to the center so that all corners were equal distance from the camera. Once you have this dialed-in, you can test the center-to-corner sharpness of your lens at different focal lengths and apertures and determine whether you may have any sharpness issues with your copy. Initially I thought I had a bad lens copy that was soft and de-centered, but after getting this procedure right, the lens proved to be sharp.
While there are other excellent options such as the Canon 17-55 EF-S f2.8 lens, this one is full-frame compatible, it's weather sealed, it has superior build quality, it's an L lens with that unmistakable red ring at the end, and it's the next greatest lens bargain second to the 70-200 f4L. While the hood may look odd, remember that it was intended for a full-frame camera where this lens would be a true 17-40mm - making a shallow hood necessary.
By C. cooney
I've been using this lens for a couple of months now and I must say that I'm very pleased. I use a rebel xti (1.6 crop), so this is a medium wide lens for me.
pros:
* good close up lens for indoor photos if you have good light
* enough angle to photo someone from close up
* light and feels balanced
cons:
* it's an f/4 at best, so without a flash, it's hard to get good shots in low light.
* the front element is convex - not a con per se, but you'll want a uv filter to protect it
I've shot in a house party with medium - dim lighting, and without a flash (which is my preferred usage), it requires some work with Pshop to get the pictures to come out well. If I could get an f/2 of thi it'd be great, but heavy and expensive.
By Clinton J. Wolf (Chicago, IL USA)
This is my least favorite lens and I would strongly suggest not purchasing it. I photograph weddings and parties, and have used this lens a LOT. It almost totally lacks color saturation, contrast and sharpness. Almost every picture that I have taken with this lens needs some serious tweaking in Photoshop. If you are looking for a wide angle lens, I would urge you to go with the primes. Every prime I have is far sharper than this lens, and EACH take much better photos in terms of color, contrast, etc. I realize that the primes lack the ease of zooming, but they take much better pictures. To me, that's all that matters. Zoom with your feet!
By Jonathan R. Houck (New Jersey)
This is the lens I use 90% of the time. Its a great investment. Pictures are sharp and the wide angle zoom suits most needs. The construction s typical L - great. I've used this lens on several Canons and have always had positive results. Expensive, but worth it.
By b.rivard
I am in love with this lens. There isn't a single thing I would change about it. It's really light but it's built like a small tank. Images sharp at f/4, and ridiculously sharp at anything from f/5.6-13. If you're looking into buying this lens, just do it. You wont be disappointed for any reasons at all whatsoever. And since its Canon's cheapest "L" lens, you really can't go wrong on the price either. Im a teenager and I saved up for more than a year for this and an accompanying full frame 5D, and the combo is more than I could have imagined. Really satisfied with my purchase, and as always, amazon shipped it FAST and pain free.
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Buy Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras Now
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