Summary: I got this lens to replace my non IS 70-200. Most of my photography is long lens landscape images for publication. The IS feature is great! I'm now getting those off the cuff, grab shots that I've missed in the past while driving or moving through the field without a tripod. It just doesn't get any better then this. I'm even using this IS lens for panoramas without tripod. WOW!
Summary: I so happy with this lens, It was a hard decision, because I couldn't decide what lens is better. I got the professional website (lens test) : [@] and find out the Canon 70-200 F4 IS has better test than F2.8, and for much better price. Thank You B&H!!
Summary: I bought this lense after much deliberation and comparison against the 70-200mm F2.8. Went for the F4 after noting the better CA test results and later model IS and cheaper price. I took a few photos after its delivery to check it out. The following day I walked around a space museum in the Alabama heat carring the lense in the soft bag provided. To my horror my new lense slipped down my sweaty arm and dropped about 2 foot onto the ground! It made me feel sick!!
Pros: Durable, Lightweight, Rugged, Sharp Focus, Strong Construction
Summary: Bought this lens as a step up from my previous telephoto: a Sigma 70-300 f/4-5.6. While shorter in range, I am happy to say this L lens really delivers its promise of optical excellence. While I was quite happy with the Sigma (I think it offers great bang for the buck) and took many good pics with it, I found there is a certain magic about this L lens that one can only appreciate after using it. The construction is solid and feels balanced on my 400D (Rebel XTi).
Pros: Consistent Output, Lightweight, Sharp Focus, Strong Construction
Summary: I am using this lens with my Canon 450D, and it is amazing. It replaces my Canon IS 70-300 lens, and takes much sharper images, and runs much quicker and quieter. The weight for quality is amazing also. This is a definite must have lens for all camera owners.
Pros: Durable, Lightweight, Sharp Focus, Strong Construction
Summary: This is a great mid-telephoto zoom lens that delivers superior image quality. So far it has proven capable of performing as an indoor portrait lens but really excels at outdoor/wildlife photography. The color, contrast, and sharpness are simply phenomenal and the size/weight are not too much to carry around...a great match on a 40D. The IS will spoil you- beware.
Pros: Consistent Output, Easily Interchangeable, Sharp Focus, Strong Construction