Excerpt: I just bought this lens again after having mine stolen in Europe. I take this lens where ever I travel. With my trusty 24-105 and this 100 to 400, I have a huge focal range to cover just about any situation. Its a must have for me!
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction
Excerpt: I use this lens for pictures of rocket launches at Cape Canaveral, Fl. and wild life photography at Everglades National Park I use it at night time and day time, very good pictures if placed on a tripod for shots at 400 mm with a Canon 7D.
Excerpt: Just bought this to use on an couple upcoming trips. This lens is very well built. It took a few minutes to adjust to using a slide zoom versus a twist type but it works well. Excellent optics.
Canon Lens is the Best 100-400mm special for sport, Great Value for the $$$
1 October 2014
Summary: The Canon EF 100-400mm F4.5-5.6L IS USM is a stabilized super-telephoto zoom lens for Canon's full-frame and APS-C digital SLRs. One of the older L-series lenses in Canon's current lineup, the 100-400mm has long been a favorite of enthusiast photographers working in the sports and wildlife fields, and it is compatible with Extenders 1.4x II and 2x II for even more reach (albeit with a penalty in maximum aperture and critical image quality).
Excerpt: the lens is a little heavier than I expected, but the auto focus is good. I use it with a T1i. While I would prefer a twist zoom, the slide zoom works OK. I have not tried it yet with a tele converter.