High-performance,
L-series telephoto zoom lens combining light weight and compactness
with an f/4 maximum aperture. Inner focusing and the ring USM enable
quick and quiet autofocusing. Also, a circular polarizing filter can 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.