The Canon EF 17-40mm f/4L USM Lens is a staple for most photographers. I purchased mine about 10 years ago, and I am about to retire it.
I am going to start off with the reason that I am retiring the lens first, rather than why I purchased it. I am certainly not going to be upgrading the lens. I simply don’t need it anymore, so although this is a lifetime review, this is actually the first time that I am retiring a lens rather than upgrading. My work simply no longer requires this lens as of this weekend. So, it will probably be popped into one of my kit bags and used for the odd time-lapse or more probably left to gather up dust. I have had a great time working with this lens, and I have shot some billboards, editorials, and point of sale images with it, and my clients have always been happy when I have used it. I have also rented better lenses of a similar nature when I knew that this lens woouldn't be up to scratch for the particular client.
Why I Purchased the Lens
When I began in photography, I was shooting weddings. Like many of us, this seemed like the easiest way to make money with a camera. I worked with a long-standing and well-equipped photographer in the area who, among other lenses, owned the Canon EF 17-40mm f/4L USM Lens. The possibilities that this lens opened up at 17mm when taking photographs in the bride's or groom's house and in the evenings during the party were amazing. It was a great lens for storytelling and adding drama to images. At the time, I owned 35mm, 50mm, and 85mm lenses. This was the next lens that I added to my bag; shortly after, I also purchased a 70-200mm lens to cover the other end of the spectrum.
The lens is very light and plastic-feeling; however, after 10 years of use in the rain, sand, being bashed into walls at weddings, and generally mistreated, it looks pretty much the same as the day I purchased it. The focus ring has occasionally become a bit gritty when I have shot in the rain for four or more hours unprotected, but after a 24-hour dry-out it is usually fine.
The lens really shines in this department. There is the odd time in backlit situations where you have to mask part of the lens with your hand in order to grab focus, but I feel that this is perfectly acceptable for a lens this wide. Apart from that, the lens snaps into focus in the darkest of rooms, and I haven’t ever had to do any microadjusting on my cameras with it, unlike almost every other Canon lens I have ever purchased. The rear gasket keeps the shutter dry, and the body of the lens is pretty well weather-sealed once a filter is applied, although this obviously has its limitations.
How I Used it
To begin with, I used it to photograph weddings. And I pretty much exclusively used it at 17mm. I am not a big fan of zoom lenses, as my brain can’t work fast enough to calculate the exact focal length I need for a situation, so when I do use them, it is either as wide as they go or as tight as they go. And for me, 17mm is the reason I purchased this lens. Once I started to shoot more than just weddings, I ventured into portraits. Using the 17mm focal length gave me some cool creative options, although it is clearly a bit of a one-trick pony, so it didn’t come out that often. But being able to really suck in loads of the background or get loads in the frame while distorting the face is pretty useful at the right time. Now that I work more with food, it isn’t really used for anything more than time-lapse work and behind the scenes images. I went through a phase of shooting a time-lapse for Instagram every time I shot something new.
There isn’t a great deal to write home about here. It is below average, and there is no particular look to the images that this lens produces, bar being ultra-wide. But for that application, it doesn’t seem to be a major downside to me. Yeah, there are higher-resolving lenses out there, but they have a price tag to match. On a sensor that is 20 megapixels or below, it does a pretty good job of capturing the details. Anything above this, and you get a lot of bad pixels. If this is your first zoom L lens, though, you will certainly notice an increase in image quality. However, I don’t think that it gives the same image quality as the other zoom lenses in the lineup.
The price of this lens in both a cost per use (I reckon it has another 10 years of life left in it easily), image quality, and versatility is amazing. I don’t think there is another lens that I would have chosen for a similar price range, and for my requirements, the more expensive Canon EF 16-35mm f/2.8L III USM Lens lens just didn’t really add anything. The build quality and weather-sealing have been amazing when I have needed them, and it has always felt like a lens that wouldn’t let me down and that I could use in the worst of weather, which is very reassuring as a professional. I would imagine that the lens' aperture blades have easily been opened and closed a million times since I purchased it, and it has never needed to be serviced.
It lacks detail. This lens really isn’t a sharp lens at all. If you are looking for great optics, this isn’t it. There is also no real feel to the rendering of the images, although I find this to be true of all zoom lenses from Canon. The f/4 can be a bit tricky for some people, although as I artificially light everything, it is less of a bother to me. If you are looking for something sharper and faster, then Canon does have these options, but the price tags are far too high for what I would need them for.
This lens is a great bit of kit for the price. Landscape photographers and interior photographers often have it in their bags, and I have certainly found it useful when shooting weddings, portraits and any form of behind the scenes or documentary work, and I could 100% recommend buying this if you don’t already own a lens wider than 24mm.