--- product_id: 1156890 title: "EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras" brand: "canon" price: "$1644.67" currency: USD in_stock: true reviews_count: 7 category: "Canon" url: https://www.desertcart.us/products/1156890-ef-17-40mm-f-4l-usm-ultra-wide-angle-zoom store_origin: US region: United States of America --- # Ring-type USM fast silent AF 17-40mm ultra-wide zoom Weather-resistant build EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras **Brand:** canon **Price:** $1644.67 **Availability:** ✅ In Stock ## Summary > 📸 Capture the world wider, faster, and sharper — the pro’s ultra-wide essential! ## Quick Answers - **What is this?** EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras by canon - **How much does it cost?** $1644.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/1156890-ef-17-40mm-f-4l-usm-ultra-wide-angle-zoom) ## Best For - canon enthusiasts ## Why This Product - Trusted canon brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Speed Meets Silence:** Ring-type Ultrasonic Motor ensures lightning-fast, whisper-quiet autofocus for those decisive moments. - • **Built to Brave the Elements:** Weather-sealed construction paired with 77mm filter compatibility keeps you shooting rain or shine. - • **Consistent f/4 Aperture Power:** Maintain exposure and depth-of-field control across the zoom range for professional-grade images. - • **Expand Your Creative Horizons:** Ultra-wide 17-40mm zoom captures breathtaking landscapes and dynamic interiors with stunning clarity. - • **Iconic L-Series Quality & Style:** Red-ringed Canon L lens delivers legendary sharpness, contrast, and resale value — a true status symbol. ## Overview The Canon EF 17-40mm f/4L USM is a professional-grade ultra-wide zoom lens designed for Canon SLR cameras, featuring a constant f/4 aperture, three aspherical elements plus a Super UD glass element for superior optics, and a fast, silent ring-type ultrasonic motor autofocus. Weather-resistant and compatible with 77mm filters, it offers a versatile 17-40mm focal range ideal for landscapes, weddings, and events. Lightweight yet rugged, this L-series lens balances premium build quality with affordability, making it a top choice for serious photographers seeking wide-angle excellence. ## Description Product Description Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital Cameras. Boasting weather-resistant construction similar to other high-end L-series Cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. From the Manufacturer Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. Focal length: 17-40mm Maximum aperture: 1:4 Lens construction: 12 elements in 9 groups Diagonal angle of view: 104 to 57 degrees (at 30 feet) Focus adjustment: Inner focusing system with USM Closest focusing distance: 0.9 feet Zoom system: Rotating type Filter size: 77mm Dimensions: 3.3 inches in diameter, 3.8 inches long Weight: 1.1 pounds 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/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. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens.What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. Review: Great lens!! But disappointing service by desertcart this time... - First of all, let me start to talk about the delivery/desertcart.com service for this purchase of mine. About the delivery/service: (skip this part if you are only interest in the lens review :) ) Usually I am very content with desertcart's service. They respond fast and if something goes wrong, they compensate one. Unfortunately this time, things weren't as great. And to be honest I was just disappointed of the service. I have an desertcart-Prime account and therefore 2days delivery was 'guaranteed' (cite) since I have purchased this item from desertcart. If it was not desertcart prime and if it was just delayed for a day, I wouldn't bother mentioning it. Yet this time, the delivery was all confusing. I received daily messages that the item was out for delivery and a couple hours later that the item has to be sent back because of a wrong location. The lens ended up coming late about one week. All wouldn't be as but if I didn't have work to do and a travel for the weekend, for which I both bought this lens for. It is not the fact that it came late which disappoints me so much, it was the fact that desertcart guaranteed two day shipping and as they were usually reliable, I sold my other lens, expecting this one to come on time (It should have come on Wednesday, so I did calculate a possible two day delay...). It is moreover the opportunity costs I had to pay because I did not have a lens in this range neither for work, nor for my journey. desertcart did offer me some kind of compensation on the first day of delay, a $15 certificate for the next purchase from desertcart.com. To be honest with you, this was not worth even a tiny bit of what I missed due to the delay. And until now, I haven't received any information about the further process yet. In this case they should have kept better contact with their delivery/supply chain. Now we come to the hot part :D As you can see I still gave the lens 5 stars, because the lens itself is a great piece of glass. I got the lens while it was still on a very good deal! I just got my copy of this lens today and tried it out right away and I am already happy with this lens! And as you can see I wasn't able to wait to share my excitement (which was quite dampened by the delay though) Just look at the pictures which were uploaded. This thing is just great! 1) Overall first impression and optical quality: I am currently using a Canon 7D. My other lenses are: Canon 70-200mm f/4 L, Canon 50mm f/1.8 and Rokinon 8mm f/3.5 fisheye. The Canon 17-40mm f/4 L just completes my kit. I haven't had the opportunity to fully tet the lens yet. What I can say is that in good to decent light conditioning this lens is performing at its best! The details, the saturation and the contrast are great with this lens. Moreover you can get really really close to the object. I have the feeling that you could use this one even as a macro lens. I might be one of the lucky person who got a very good copy of this lens, but I am very pleased with Canon so far and think, that their Quality control is really good. And yes - this thing is BOKEHLICOUS :) Nice, smooth Bokeh! 2) The build quality Those who had the pleasure to use L lenses before can tell that the build quality and ergonomic of these or second to none. And the 17-40mm f/4 L is no exception. In fact, this lens is one of the lightest Canon L lenses. But lighter does not mean cheaper. In opposite! The build quality is great. A very sturdy piece of glass, good weight to carry it around all day, attached to a big camera such as the 7D or 5D MarkII without getting tired. One also has to mention that this lens is weather sealed. IMPORTANT NOTICE: The weather sealing is only complete when you mount a 77mm UV Filter onto it (I decided to buy Hoya . very good quality, reasonable price. No flare at all.) 3) The price This is in fact of the most affordable lenses by Canon. And yes, call it: BANG FOR THE BUCK. Of course, everything has to be regarded in relative terms. Whoever can really call around $700 to be cheap probably doesn't have quite a tight wallet as most of us. But in terms of L lenses, yes, this one is one of the most inexpensive glasses you can get. And don't be fooled by the price, this has nothing to do with the quality! 4) What's great about it? a) It is an L lens b) Resale price does not drop significantly over time c) comes with leather lens-bag and hood (for ASP-C DSLRs one has to be another hood though, since this is actually a FF lens) 4) looks sexy because of the red ring ;) 5) Compatible with FF DLSRs (for the future)! And lastly, yes this lens does not have IS. But at this wide angle one usually does not need one. And yes, this lens only has an aperture of f4. But as always, ask yourself what you really need and if you really need the extra stop to f2.8 which costs you almost $1000 more. For me, this lens is all fine. Shooting in really poor light conditions might be a little tough, but that's when you should use a flash and/or a monopod/tripod. But even handheld I did not have a huge problem with this lens, most of all because of the ability of the newer cameras such as the Canon 7D to perform quite well in low light in terms of dealing with high ISO. An update will be coming soon, which will include more about the performance in normal and also in low light! Review: Must-Have for APS-C Cameras - 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. ## Features - 17-40 millimeter ultra wide angle zoom lens with f/4 maximum aperture for Canon SLR Cameras. Diagonal angle of view 104° 57° 30' - 3 aspherical lens elements and super UD glass element create superior optics in all conditions, Closest focusing distance: 0.9 feet - Powerful ring type ultrasonic monitor (USM) produces fast and silent autofocusing, Focuses as close as 11 inches, supports screw in 77 millimeter filters or up to 3 gel filters. 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 - Suitable for Wedding/Nature Photography, Weather resistant construction, Water and Dust Resistant, measures 3.3 inches in diameter - EF-Mount Lens/Full-Frame Format ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00009R6WO | | Best Sellers Rank | #1,517 in SLR Camera Lenses | | Brand | Canon | | Built-In Media | Lens | | Camera Lens | Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras | | Color | Black | | Compatible Camera Mount | Canon EF | | Customer Reviews | 4.6 4.6 out of 5 stars (867) | | Exposure Control Type | Manual | | Focal Length Description | 17-40 lens | | Focus Type | Auto Focus | | Global Trade Identification Number | 00013803028058 | | Has Self-Timer | No | | Image stabilization | Digital | | Item Weight | 500 Grams | | Lens | Wide Angle | | Lens Coating Description | Super Spectra Coating | | Lens Design | Zoom | | Lens Fixed Focal Length | 17 Millimeters | | Lens Mount | Canon EF | | Manufacturer | Canon Cameras US | | Maximum Focal Length | 40 Millimeters | | Media Type | ProductImage | | Minimum Aperture | 4 f | | Minimum Focal Length | 17 Millimeters | | Model Name | EF17-40mm f/4L USM | | Number of Diaphragm Blades | 7 | | Photo Filter Size | 77 Millimeters | | Real Angle Of View | 104 Degrees | | UPC | 132017923253 013803028058 | | Warranty Description | 1 year coverage for labor, 1 year coverage for parts | | Water Resistance Level | Water Resistant | | Zoom Ratio | 2.35:1 | ## Product Details - **Brand:** Canon - **Camera Lens Description:** Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras - **Compatible Mountings:** Canon EF - **Focal Length Description:** 17-40 lens - **Lens Type:** Wide Angle ## Images ![EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras - Image 1](https://m.media-amazon.com/images/I/71M6e45X1OL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: How wells dose the Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens perform in low light situations?** A: This is a bit vague, so I am going to shotgun you some responses here. 1. Depends on camera - If you have a full frame camera like a 6D or 5D, you can use higher ISO without gaining too much noise. So this lens can be decent, though I would think the lack of a wider aperture or IS will still hurt you. IF you have a crop frame camera like a Rebel, mid range (80D, 77D), or 7D, then it is not the lens for you. On those camera the EF-S 17-55mm F2.8 IS USM is a much better choice for 50 dollars more. It has several advantages over 17-40mm; just as wide with a longer reach, a full stop more light, image stabilization, and significantly less distortion (the 17-40mm is worse at all levels of the zoom, even 40mm is worse that the 17mm of the 17-55mm). The 17-40mm is designed for full frame cameras, and while it will fit, the 17-55mm is made for a crop sensor body, and thus is optimized for sharpness with that setup. 2. Depends on the intended use - We talking indoor sports? Then no, this will not be good for that on any camera. Astrophotography? Also no, you would want somethign that is at least F2.8 for that. Taking shots of kids playing in the house? Maybe, if you can live with having to bump your ISO up to higher levels to get exposure up. Museum? Again, higher ISO to get that better exposure, or a flash. Can't be a built it flash either, has to be a speedlight, as a built in flash will cause a shadow in your photos from the lens Blocking part of the flash. Landscape? If you are using a tripod and can therefore shoot whatever shutter speed you need at whatever ISO you want, then it can work. But if on a crop sensor, there are less expensive options for all that, so if you have one of those then look at the EF-S 10-18mm instead. I just really don't suggest this lens to people most the time, as I feel that for the money there are better choices. On a full frame, from Canon, this is the least expensive option, but if you can save up a little longer, then I would suggest the EF 16-35mm F4L IS USM instead. Not only do you get 4 stop IS that will allow you to shoot at much slower speeds in low light, it is also the sharpest wide angle lens that Canon makes. It's 1000 USD compared to 750 USD, and worth the investment if you can wait until you have the money. If you have a crop sensor, then the other two lenses I suggested are a better bet. **Q: Im replacing a 18-135 efs lens. its between this and 16-35mm. i will use it for street photos, landscape, and portraits. money is an issue. thoughts?** A: That is a tough question. While both lenses have similar focal ranges, the key difference is that the 17-40mm has a max aperture of f/4 and the 16-35mm has a max aperture of f/2.8. That allows the 16-35mm to be more useful in low-light situations, as well as situations when a relatively shallow depth of field is desired. I take mostly landscape shots, and the 17-40mm has served me well for that purpose. I also imagine it would be good for street photos, assuming you wouldn’t be needing a shallow depth of field. Given I don’t usually take portrait photos, I can’t comment much on that, but if money is an issue, I feel you could get by with the 17-40mm. **Q: Wondering how this lens will do with shooting sports? thanks!** A: It really depends on what your looking to achieve with your shots. If your looking to get the "Big" picture then this is a capable lense. If your looking to get the sweat flying off someone's eyebrow then this wouldn't be the lense to use. I shoot with a 300mm 2.8 for sports. Sports are extremely tough to shoot. **Q: I'm looking for a lens for my RebelXSi to shoot interior shots of rooms, aka House Beautiful, Architectural Digest look. Yea, nay or what else?** A: Remember you'll need to factor in x 1.6 for the crop sensor... But it should work but expect to see 27.2-64mm not 17-40mm ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great lens!! But disappointing service by amazon this time... *by A***N on December 5, 2011* First of all, let me start to talk about the delivery/amazon.com service for this purchase of mine. About the delivery/service: (skip this part if you are only interest in the lens review :) ) Usually I am very content with amazon's service. They respond fast and if something goes wrong, they compensate one. Unfortunately this time, things weren't as great. And to be honest I was just disappointed of the service. I have an Amazon-Prime account and therefore 2days delivery was 'guaranteed' (cite) since I have purchased this item from amazon. If it was not amazon prime and if it was just delayed for a day, I wouldn't bother mentioning it. Yet this time, the delivery was all confusing. I received daily messages that the item was out for delivery and a couple hours later that the item has to be sent back because of a wrong location. The lens ended up coming late about one week. All wouldn't be as but if I didn't have work to do and a travel for the weekend, for which I both bought this lens for. It is not the fact that it came late which disappoints me so much, it was the fact that amazon guaranteed two day shipping and as they were usually reliable, I sold my other lens, expecting this one to come on time (It should have come on Wednesday, so I did calculate a possible two day delay...). It is moreover the opportunity costs I had to pay because I did not have a lens in this range neither for work, nor for my journey. Amazon did offer me some kind of compensation on the first day of delay, a $15 certificate for the next purchase from amazon.com. To be honest with you, this was not worth even a tiny bit of what I missed due to the delay. And until now, I haven't received any information about the further process yet. In this case they should have kept better contact with their delivery/supply chain. Now we come to the hot part :D As you can see I still gave the lens 5 stars, because the lens itself is a great piece of glass. I got the lens while it was still on a very good deal! I just got my copy of this lens today and tried it out right away and I am already happy with this lens! And as you can see I wasn't able to wait to share my excitement (which was quite dampened by the delay though) Just look at the pictures which were uploaded. This thing is just great! 1) Overall first impression and optical quality: I am currently using a Canon 7D. My other lenses are: Canon 70-200mm f/4 L, Canon 50mm f/1.8 and Rokinon 8mm f/3.5 fisheye. The Canon 17-40mm f/4 L just completes my kit. I haven't had the opportunity to fully tet the lens yet. What I can say is that in good to decent light conditioning this lens is performing at its best! The details, the saturation and the contrast are great with this lens. Moreover you can get really really close to the object. I have the feeling that you could use this one even as a macro lens. I might be one of the lucky person who got a very good copy of this lens, but I am very pleased with Canon so far and think, that their Quality control is really good. And yes - this thing is BOKEHLICOUS :) Nice, smooth Bokeh! 2) The build quality Those who had the pleasure to use L lenses before can tell that the build quality and ergonomic of these or second to none. And the 17-40mm f/4 L is no exception. In fact, this lens is one of the lightest Canon L lenses. But lighter does not mean cheaper. In opposite! The build quality is great. A very sturdy piece of glass, good weight to carry it around all day, attached to a big camera such as the 7D or 5D MarkII without getting tired. One also has to mention that this lens is weather sealed. IMPORTANT NOTICE: The weather sealing is only complete when you mount a 77mm UV Filter onto it (I decided to buy Hoya . very good quality, reasonable price. No flare at all.) 3) The price This is in fact of the most affordable lenses by Canon. And yes, call it: BANG FOR THE BUCK. Of course, everything has to be regarded in relative terms. Whoever can really call around $700 to be cheap probably doesn't have quite a tight wallet as most of us. But in terms of L lenses, yes, this one is one of the most inexpensive glasses you can get. And don't be fooled by the price, this has nothing to do with the quality! 4) What's great about it? a) It is an L lens b) Resale price does not drop significantly over time c) comes with leather lens-bag and hood (for ASP-C DSLRs one has to be another hood though, since this is actually a FF lens) 4) looks sexy because of the red ring ;) 5) Compatible with FF DLSRs (for the future)! And lastly, yes this lens does not have IS. But at this wide angle one usually does not need one. And yes, this lens only has an aperture of f4. But as always, ask yourself what you really need and if you really need the extra stop to f2.8 which costs you almost $1000 more. For me, this lens is all fine. Shooting in really poor light conditions might be a little tough, but that's when you should use a flash and/or a monopod/tripod. But even handheld I did not have a huge problem with this lens, most of all because of the ability of the newer cameras such as the Canon 7D to perform quite well in low light in terms of dealing with high ISO. An update will be coming soon, which will include more about the performance in normal and also in low light! ### ⭐⭐⭐⭐⭐ Must-Have for APS-C Cameras *by P***V on December 28, 2009* 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. ### ⭐⭐⭐⭐⭐ Review *by A***A on October 19, 2018* Awesome product. A beginner in the L series but serves as a tank for general purpose photography. The lens is particularly sharp above 24 mm at focal ranges of f5.6 or more. ## Frequently Bought Together - Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras - Tiffen 77UVP Slim 77mm UV Protection Filter for Camera Lens, Clear Optical Glass, Impact Resistant, Made in USA --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/1156890-ef-17-40mm-f-4l-usm-ultra-wide-angle-zoom](https://www.desertcart.us/products/1156890-ef-17-40mm-f-4l-usm-ultra-wide-angle-zoom) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*