Summary: I primarily shoot with a 50mm and canon 5D camera. After trying several wide angle lenses, I opted for this lightweight wide angle zoom given the price point and ease I carrying it all day. I will mostly using this for landscapes and architecture photography.
Excerpt: This is becoming my new 'favorite' lens. First it's 2.8 so it's pretty fast. On my 7DMII, crop sensor it gives a little step back, which is great for architecture and landscapes. (90 degree field of view) Note: This is not a portrait lens, not for closeup people photography.
Pros: Fast / accurate auto-focus, Lightweight, Strong Construction, USM
Excerpt: Very flexible and sharp - versatile, light and sturdy. we are using this for a special teaching video shot under hard circumnstances on location and hot and dusty environments.Gives excellent results!
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Rugged
Summary: I use this lens all the time and am very pleased with the image quality and ease of use. One thing you should be sure of is whether this will work on your EOS camera. Because sensor my 40D has, it cannot take advantage of super wide angle lenses.
Summary: I use a T3i crop sensor camera and wanted a 35mm equivalent mainly for video work. I use this lens about 50/50 for photo and video. This one since it functions like a 32mm I find it is a very versatile focal length. I find it to be great in low light, vivid color, and sharp at 2.8.