A 70 - 200 zoom lens is a must have lens for all photographers. If you shoot a Canon dslr camera you won't go far wrong with the 70 - 200 f2.8L IS USM lens. This is a very popular lens amongst professional photographers and when you see what this lens is capable of it is easy to see why.
If you are in to your sports and wildlife photography the Sigma 150mm - 500mm is the lens for you, and this great lens will capture some awesome images. Fora review of this lens take a look at this article, whcih also lists the 5 best Sigma lenses for Canon cameras of all time. A useful article if oyu are thinking of buying a new lens for your Canon camera.
The Nikon AF Zoom-Nikkor 80-200mm f/2.8D ED Lens is a fast telephoto zoom lens, ideal for indoor sports photography and photojournalism in dim light. It incorporates Autofocus (AF) and Internal Focusing (IF) technology and ED glass for sharp pictures.