One of the finest telephoto zoom lenses in the EF line, the 70-200 f2.8 is comparable to a single focal length lens. It has four UD-glass elements to correct chromatic aberrations. Its constant f/2.8 maximum aperture and superb image quality make it one of the most popular professional SLR lenses in the world. Compatible with optional Extender EF 1.4x II and 2x II.
£895.99 delivered http://www.martinscamerashop.co.uk/canon-ef-70-200mm-f28-l-usm-247-p.asp