Edge-to-edge sharp with unbelievable range clean non distorted image. The best ultrawide in my Arsenal in all the years of shooting architecture phenomenal lens

Never expected to be able to utilize such an incredible lens for both our equipment shots and recreational shots. Sharp, crisp all over and as well made as my Canon 24-70mm. With the 30-day return policy, I just had to try it and after using it, will keep it!

This lens rivals primes in the ultra wide spectrum. It is large and a little unwieldy, especially in its protruding front element which all by itself prompted me to purchase the Canon CarePak. But for performance, this thing is truly excellent. No edge distortion, minimal chromatic aberration and a fully rectilinear rendition every time. It's marvelous.

11mm is much wider than I expected and the field of view offered by this lens is staggering. It's so wide, it's easy to accidentally get your feet or a building wall behind you in the frame! Build quality is impressive, and the lens doesn't feel as heavy as some reviews make it out to be. The front the lens is wide, but overall it is quite stumpy and fits easily into my camera bag when placed on its side. Not being able to use a protective filter over the front element does keep me from pulling this out if it's misting or raining (not because it would hurt the lens, but because the mist easily gets on the lens and affects the photo), but I'm not worried about dust or dirt, as I keep a Rocket blower handy. Modern lens coatings are tough, and I'm not worried about the elements hitting the element. This lens is wonderful for capturing cloudscapes that would normally require multi-shot panoramic techniques. I find myself switching between this and the 100-400 II quite naturally for unique landscape perspectives. At f4 there is substantial vignetting - and I mean substantial, but it can be corrected in Lightroom or used creatively to focus the viewer on the center of the frame. I find this lens captures so much contrast in a high-contrast scene (using the 5DsR to capture sunsets with extreme brights and darks), that in Lightroom I have to pull the Contrast slider all the way back to -100, then use the Dehaze effect to bring back the detail. In doing this, I've found I can closely mimic or even slightly surpass the cloud detail and rendering I get with the Leica Q. This lens would likely perform well with multiple-exposure blending in these high-contrast scenarios, but I am not the sit-and-wait-with-a-tripod type. I would love it if Canon released a prime 11 mm f2.8 or f4 IS as a close cousin to this lens.

Professional essential

Just an amazing lens!

I'm a landscape photography. I've been comparing this lens to my Canon 17 mm tilt-shift - a tough lens to beat. This lens is sharp & compares well - wish it were faster & had shift. I'm still a bit on the fence - will it have a place in my camera bag? Pros: the lens is sharp. It enables a different perspective, opening new horizons beyond the routine landscape photography. Color is great. It is auto focus. Cons: At 11 mm It does exhibit some chromatic fringing, especially at the horizon, but the lens profile in LR does a good job of fixing this. Used at about 17 mm to 24 mm I find it compares very well with the 17 mm tilt-shift, minus the convenience of shift & the fine tuning of tilt to optimize depth of field. Maybe I'll get a bigger bag! Attached photo: I rarely include roads in my photos - this photo at 11 mm taken at my favorite haunt in Dolly Sods WV opens a new & different perspective for me. This would not work with less than 11 mm.

I purchased this lens few months ago and using for landscape. That's was amazing, super wide picture, sharp, details. The feeling of holding hand is very good.The lens is suitable for architecture I just regret that is has no IS mode.

What a lens! Yes it's F4 however that has yet to present a real issue. We've been using this on a RED weapon with a Ronin and having the ability to go this wide and then zoom in on the fly is such a time saver. Debated between this and the Zeiss 15mm 2.8 for a while. I've used both extensively and decided to go with the canon for the flexibility, additional width on a cropped sensor and honestly after comparing both at 15mm, the Zeiss is a little better (I love that lens) but would not be noticed by most. If you really have a need to shoot wide in low light you can pick up the sigma 24mm 1.4 for 850 and you are covered. Great distortion control and unbelievably sharp. It's heavy but if you are working with a cinema camera on a gimbal it's not super noticeable compared to the Zeiss. Highly recommend