Vari-focal photographic lens system of lens group exchange type

摘要

A vari-focal photographic lens system of lens group exchange type comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a third lens unit having negative refractive power, the vari-focal photographic lens system being arranged to vary the focal length thereof by exchanging the second lens unit for another second lens unit having different lens configuration.