| 摘要 |
A zoom lens system permitting photographing at definite magnification levels comprising a first lens unit and a second lens unit, and equipped with a first mechanism for varying f and beta so as to keep f/ beta nearly constant and a second mechanism for varying, independently of the first mechanism, the airspace between the first lens unit and the second lens unit when the reference symbol f represents total focal length of the first lens unit and the reference symbol beta designates total lateral magnification of the second lens unit. Said zoom lens system is equipped with simple mechanisms and permits photographing objects located at distances within a broad range at optional magnification levels within a certain range.
|
