One of the finest telephoto zoom lenses in the EF line, comparable to a single focal length lens. It has four UD-glass elements to correct chromatic aberrations. The newly designed multiple zoom groups for inner focusing bring high image quality throughout the entire zooming range. Compatible with Extender EF 1.4x and 2x.
* Lens construction: 18 elements in 15 groups
* Diagonal angle of view: 34°-12°
* Focus adjustment: Inner focusing system with USM
* Closest focusing distance: 1.5m / 4.9ft
* Zoom system: Rotating type
* Filter size: 77mm