Telephoto type objective

Details Telephoto type objective Telephoto type objective

1976-07-26

1977-12-20

Sacher, Paul A.

G02B 960

Patent

active

040638014

ABSTRACT:
A telephoto type objective comprising a front lens group and a rear lens group axially spaced apart from each other. The front lens group has a positive refracting power and which remains stationary during focusing. The rear lens group has a negative refracting power and is comprised of two movable lens members for focusing. When the two movable lens members are moved along the optical axis toward an image plane, the telephoto type objective is caused to focus an object at a near distance from its focusing on an object at a far distance with the resulting amount of movement of the rear lens member being larger than that of movement of the front movable lens group.

REFERENCES:
patent: 2503789 (1950-04-01), Wood et al.
patent: 3854797 (1974-12-01), Yokota

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