Excerpt: I saw this lens on the B&H website and ordered it not realizing it was not stabilized. At 74 years old, I am not as steady as I used to be so returned it. Those images (see attached) I took with the camera braced were very nice. It's a winner for the not so shaky or tripod crowd!!!!
Excerpt: I have used a friend of mine s lens a few times before I buy one. I buy mine to shoot an interior of a new house. My 24-105 was not quite wide enough to get the shots I wanted. I was using it on a tripod with just the ambient light with my 5D and got some great shot. My other use has been landscape.
Summary: You cannot beat this lens as an end in itself, but if you attempt to stitch a pan at close range, you will discover some interesting distortion realities. Even long range shots will give interestingly distorted cloud formations without attempting any stitching.
That being said the 17-40 is a great lens that can be very sharp
jon manjeot, Amazon
13 August 2015
Summary: If your looking for an entry canon L lens this is not it. Look to the 24-105mm f/4. That being said the 17-40 is a great lens that can be very sharp, wide and practical for walk around use. However, the flaw of this lens is the lack of IS, image stabilization.
Excerpt: I shoot interiors for a real estate company and this is by far my favorite lens to use. Its a beautiful lens with crystal clear images. The distortion is definitely noticeable which is a downside but is easily fixed with Lightroom's lens corrections.