Canon EF 17-40mm f/4L USM Lens

Canon EF 17-40mm f/4L USM Lens

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Canon EF 17-40mm f/4L USM Lens

B&H # CA17404LEF MFR # 8806A002 Imported
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Product Highlights

  • EF-Mount Lens/Full-Frame Format
  • Aperture Range: f/4 to f/22
  • One Super Ultra-Low Dispersion Element
  • Three Aspherical Element
  • Super Spectra Coating
  • Ring-Type Ultrasonic Motor AF System
  • Weather-Sealed Construction
  • Rounded 7-Blade Diaphragm
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Canon 17-40mm f/4.0 overview

  • 1Description

Spanning a versatile wide-angle range, the EF 17-40mm f/4L USM Lens is a Canon L-series zoom featuring a constant f/4 maximum aperture along with a sophisticated optical design and durable construction. One Super UD element is featured, along with three aspherical elements, which help to reduce both chromatic and spherical aberrations in order to realize high sharpness, clarity, and color accuracy. A Super Spectra coating has also been applied to suppress flare and ghosting for improved contrast in difficult lighting conditions. Complementing the imaging capabilities, this wide-angle zoom also features a ring-type USM and internal focusing mechanism to afford quick, quiet, and accurate autofocus performance, as well as full-time manual focus override. Additionally, this lens is weather-sealed for use in trying environmental conditions.

Wide-angle zoom is designed for full-frame Canon EF-mount DSLRs, however can also be used with APS-C models where it provides a 27.2-64mm equivalent focal length range.
Constant f/4 maximum aperture maintains consistent illumination throughout the zoom range.
One Super Ultra-Low Dispersion glass element noticeably reduces color fringing and chromatic aberrations for high clarity and color fidelity.
Three aspherical elements minimize spherical aberrations and distortions for improved sharpness and accurate rendering.
Super Spectra coating has been applied to individual elements to minimize ghosting and flare for greater contrast and color neutrality when working in strong lighting conditions.
A ring-type Ultrasonic Motor (USM), along with an internal focusing system, is employed to deliver fast, precise, and quiet autofocus performance as well as full-time manual focus override.
Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.
As a member of the esteemed L-series, this lens is sealed against dust and moisture for working in inclement environmental conditions.
In addition to the front 77mm filter ring, this lens also has a rear filter holder for up to three cut gel filters.
In the Box
Table of Contents
  • 1Description

Canon 17-40mm f/4.0 specs

Performance
Focal Length 17 - 40mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 104° - 57° 30'
Minimum Focus Distance 11.02" / 28 cm
Magnification 0.24x
Maximum Reproduction Ratio 1:4
Optical Design 12 Elements in 9 Groups
Diaphragm Blades 7, Rounded
Features
Autofocus Yes
Physical
Filter Thread Front: 77 mm
Rear:
Dimensions (DxL) 3.29 x 3.81" / 83.5 x 96.8 mm
Weight 1.10 lb / 500 g
Packaging Info
Package Weight 1.85 lb
Box Dimensions (LxWxH) 7.0 x 5.5 x 5.5"

Canon 17-40mm f/4.0 reviews

EF 17-40mm f/4L USM Lens is rated 4.7 out of 5 by 1055.
Rated 5 out of 5 by from great price, great lens I have carried this lens for little over a year now, using it mainly for real estate photography and landscapes. For this purpose, there was no need to opt for the 16-35 f/2.8, which is double the price. The lens is also great for party shots, when you need to get a big group in the picture. Although there is some distortion, thats what you get at 17mm, with any lens. Between the weight, price, build, and sharpness, this is one of the best "L" lenses that Canon makes. I would suggest this lens to anyone interested in landscape photography, or simply want a wide angle to add to their kit. In my opinion, f/4 is plenty on an ultra wide angle.
Date published: 2014-01-23
Rated 5 out of 5 by from Great lens at a great price I use this lens as an all-purpose lens, since I have an APS-C body (equivalent FoV of 25.2-64mm). It is very light, so makes a perfect walk-around lens. This is my first L-series lens and it feels great! It feels solid, the zoom and focus rings move very smoothly. The autofocus is fast and accurate and the image quality is great. Images are sharp and, at least on a cropped APS-C sensor, show little vignetting. The only thing I don't like about it is the lens hood: it is very wide and short, so in addition to be of dubious use, it is not straightforward to store the lens with it on reverse (I have to remove it and store it separately).
Date published: 2015-03-05
Rated 5 out of 5 by from You Will Not Regret The 17-40L The 17-40L lens is an amazing lens to own. Don't just think landscapes, portraits, action photography...this lens allows you to get right up in the mix. The contrast and colors produced by this lens are perfect. Throw on a circular polorizer or neutral density filter and you'll find yourself shooting outdoors for hours. Combined with a decent body (7D) for example, F4 should not be an issue. AF is quick, lens is light and feels nice in your hands and well weighted in comparison to the camera body. What else can I say.....oh ya it's affordable. P.S. - Take a look at the Canon 85mm 1.8 if you haven't already....it's a great kept secret!!!!
Date published: 2011-07-28
Rated 5 out of 5 by from Fantastic Little Lens Love this lens. I needed a higher quality wide angle lens that the kit EF-S lens that came with my Crop camera as I knew I was going to go FF eventually. The kit was slow to focus and the images were just not that sharp. Once I put the 17-40 L on my cam body I knew I had the right lens. It has great image quality and focuses extremely quickly. The L build quality has stood up to one accidental drop with absolutely no issues aftwards. My only issue is the not great aperture of F4. I knew that going in and expected it, but one more stop would have made this the perfect lens. For the price, you just can not beat it.
Date published: 2014-07-10
Rated 5 out of 5 by from so useful! you are probably deciding between this and the pricier 16-35mm 2.8... my advice. save your money and buy this little beauty! when you are shooting ultra wide angle, you rarely need f/2.8 anyway because you generally want everything in focus in a wide shot... so why pay for more light and less length??? this is the most affordable L lens and easily one of the best. sharp all the way through the aperture range... at 17mm its wide enough for fun, creative distortion... and at 40mm its long enough for whatever else you might want an ultra wide for. if you are worried about vignetting or CA, get over it... all lenses vignette at a point. just tweak it in post production :)
Date published: 2013-08-13
Rated 5 out of 5 by from color is key! the 17-40 is arguably one of the best zooms you can buy as a canon user. yes, the 16-35 is 2.8, but it's also a grand more expensive. not quite sure if that's worth it to me yet. my favorite parts about this lens are the sharpness (especially above 5.6!) and the eyepopping color/contrast mix. i shoot with a 40D, and the 1.6x crop turns the wide end of 17mm into about a 24mm, which is surprisingly wider than i thought it would be. pllllllenty wide for all sorts of uses. built like a tank! remember to get a slim UV filter though, or you might run into some more vignetting.
Date published: 2009-04-21
Rated 5 out of 5 by from Doesn't leave my 5D MKII I bought this lens at the B&H store in NY and used it to shoot city shots for the rest of the day and evening. Since then I have shot portraits, a wedding, and much of DC with the lens. When wide open there is a bit of fish eye, but none more than should be expected. Softness hasn't been a big issue. As long as you can crank up the ISO non flash wedding shots are still an option. I wish the lens was faster, but for the price and great focal range I don't have a real complaint. I shoot with this on my 5D and the 24-105 on my 30D, which gives me wonderful coverage. After a week, I strongly believe I made a great investment in the lens.
Date published: 2010-11-18
Rated 4 out of 5 by from Good value and performance I used this lens for 4 years on my full frame bodies. I did hundreds of photo shoots with it and found that was well made and focused fast. The only down side I found with this lens was edge sharpness at 17mm on full frame bodies. It definitely was a bit soft wide open and got better as you stopped down. I now have the new 16-35mm f2.8 and find this lens is sharper around the corners. Sometimes the 17-40mm would have a tough time focusing in low light. For the money, I think it is a good value. If you can afford the 16-35mm, you will find it to be a bit sharper at the wider angle settings.
Date published: 2009-06-20
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Canon 17-40mm f/4.0 Q&A

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