Zoom lens system capable of macrophotography
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United States of America Patent
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-
Mar 10, 1981
Grant Date -
N/A
app pub date -
Jul 3, 1979
filing date -
Jul 3, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The optical system includes a variator lens and a compensator lens each adapted for cammed axial movement along the optical axis in response to rotation of a cam tube for varying the focal length of the system in a normal zoom range between a telephoto condition and a wide-angle condition. A control member is coupled to the cam tube and is shiftable between a normal range condition for preventing axial movement of the cam tube during focusing in the normal zoom range and a macrophotographic range condition which effects a cammed axial movement of the cam tube in response to rotation thereof for focusing the system in a macrophotographic range. Radially shiftable and axially shiftable control mechanisms are disclosed.
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