Excerpt: I shoot youth Football and Baseball and this lens lives on my camera about 6 months of the year. It's big and heavy but the breadth of range allows for flexibility that I'd otherwise need two bodies for. I actually like the push-pull zoom because it seems faster but it is a disadvantage when shooting through the fence on baseball.
Excerpt: This was a present from my wife, upgrading me from a 70-300mm EF. The extra 100mm really makes a difference for those more distant subjects, and the optical quality is world's better. I love the push/pull zoom, which leaves the lens well-balanced in my hand, and the IS makes a huge difference in my pan shots. Would not hesitate to recommend this to anyone.
Pros: Consistent Output, Fast / accurate auto-focus, PushPull Zoom, Rugged, Strong Construction
Excerpt: I use this mainly for wildlife and outdoor sports. It is a pretty good lens. Not as sharp as I might like. I have gotten some pretty good shots out of it though. I do have to admit that I tend to shoot hand held quite a bit and the IS handles it pretty well, even at 400mm. I kind of like the push-pull action and find that I am able to adjust pretty quickly with it.
Pros: Consistent Output, Durable, Strong Construction
Excerpt: I've been using this lens for a couple of weeks now and have put it through the paces shooting about 3000 frames. The clarity of the images is amazing. Images enlarged on the computer display virtually no chromatic aberration. The speed and accuracy of the auto focus than any after market lens I've ever used. The lens certainly isn't light especially when attached to a Conon DSLR equipped with a battery grip. But you can't have everything. Would I buy it again? You bet.
Pros: Durable, Fast / accurate auto-focus, Strong Construction
Excerpt: First the lens is big and heavy, but it was expected. My first dislike is the fact that this is a push/pull type lens, does not make for quick focusing. Used it first time in Yosemite National Park, getting used to it. Great optics so far. The next big test is my trip to Grand Teton and Yellowstone National Parks. Ultimate test is trip to Kenya and Tanzania for a safari, the primary purpose of why I purchased the lens.
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Strong Construction
Excerpt: First - I am not a professional photographer, so my standards may be a little lower. But I find the ease of use, crispness of image, and build quality to be absolutely first rate. I use this mostly for outdoor (wildlife) photos and it has not let me down. I have not found anything to knock (other than weight), yet. I would definitely recommend this lens.
Pros: Consistent Output, Fast / accurate auto-focus, Rugged