- Lens construction: 16 elements in 13 groups.\n- Diagonal angle of view: 34°-12°.\n- Focus adjustment: USM.\n- Closest focusing distance: 1.2m.\n- Filter size: 67mm.\n\nHigh-performance, L-series telephoto zoom lens combining lightweight and compactness with an f/4 maximum aperture\nHigh-performance, L-series telephoto zoom lens combining lightweight and compactness with an f/4 maximum aperture. Inner focusing and the ring USM enable quick and quiet auto-focusing. A circular polarizing filter can also be attached and used without difficulty because the front lens element does not rotate during focusing. The tripod collar (sold separately) is the same one used with the EF 300mm f/4L USM.