I bought this lens mostly to photograph wildlife and I have taken some great shots with it in the short time I have had it. The lens is light weight and easy to carry around in the field for long periods of time without causing fatigue.

Consistent Output; Easily Interchangeable; Lightweight; Rugged; Strong Construction

I bought this lens as I needed more pulling power than my 70-200 f2.8L IS could give me. Initially I was surprised how compact and lightweight it was. It is no bigger than the 70-200 f2.8 and it is noticeably lighter too.

Lightweight; Portable; Built in lens hood; Great image quality; Fast AF; 2 mode IS; Pro build quality; Good manual focus ring; 77mm filter thread; Reasonable price; Good with 1.4x extender; Comes with good quality case and tripod collar

1st generation IS; No weatherproofing; Only available in white (not good for wildlife - or muggers!