I bought this very lens about 2 years ago. I love it. The pictures I take with this lens looks like a professional has taken them.The telephoto lens is a must have for taken outside pictures.

There are many uses for the Canon EF 70-200mm f/4.0 L USM Lens, but portrait photography is one of the best. Outstanding image quality.The most dazzling lens in my bag.

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

Poor in Low Light

Very affordable.

This is one of my "trinity" of zooms I use on my 40D and 50D. If you never have tried a a professional level lens (they are called "L's in Canon-ese), you will be shocked at how smooth and solid a lens like this is!

The Canon EF 70-200mm f/4 USM L IS is capable to deliver a near-flawless performance is all categories. The resolution figures are very impressive even at max. aperture. Distortions, vignetting and CAs are usually nothing to worry about either.

I love this camera... I take railroad photographs and it is awesome. Wish it had more mm, but for the price it is plenty. Photos are amazingly sharp, even with the 1.4x extender. Focus is fast and silent.

Consistent Output; Durable; Easily Interchangeable; Quick Focus; Rugged; Sharp Focus; Strong Construction

Heavy; Scratches Easily

The Canon EF70-200mm f4L IS USM Telephoto Zoom Lens is a great and versatile lens for landscape and wildlife photography. It is very very sharp with dynamic color. It is not too heavy and is very portable. The focus is just excellent.

Sharp; versatile; portable

none

Canon EF 70-200mm f/4L IS USM is the latest addition to Canon's range of 70-200mm telephoto zooms and fills in the whole in Canon's lineup previously consisting of two faster f/2.8 variants (EF 70-200mm f/2.8L IS USM and EF 70-200mm f/2.8L USM) and another f/4 version (EF 70-200mm f/4L USM).

This was my first significant lens purchase, and it hasn't disappointed. I have a Rebel Xsi, and without the battery grip, this lens would seem a bit large on that body, but otherwise it does a phenomenal job! After much research, I decided to start with this lens to add reach to the kit lens.

Consistent Output; Durable; Easily Interchangeable; Quick Focus; Rugged; Sharp Focus; Strong Construction

Heavy

Quite simply an excellent lens. As sharp as primes in its telephoto range, great contrast and colour, and state of the art IS. What it gives up in maximum aperture to the f2.8 version can be forgiven considering it's half the weight and 2/3 the cost.