Photographic lens with variable range focus adjustment

Details Photographic lens with variable range focus adjustment Photographic lens with variable range focus adjustment

1982-11-10

1984-12-25

Corbin, John K.

350255, G02B 711

Patent

active

044900180

ABSTRACT:
A photographic lens including a focus ring rotatable between prescribed end limits corresponding respectively with an infinite focus setting and a relatively close focus setting is provided with an adjustable range stop assembly for selectively setting one end limit at a position corresponding with a focus setting at which scenes or events are anticipated by the photographer. In one preferred form, the range stop assembly comprises a selector switch carried by the focus ring for movement of a control pin between stops on the lens housing wherein one of the stops is defined by a plurality of lands at different circumferential positions whereby the permissible range of focus ring rotation is selected in accordance with the position of the control pin. In an alternative preferred form, the focus ring adjustment is controlled by a pair of control pins movable between associated stops to limit ring rotation between the infinity and close focus positions, wherein one of the control pins can be adjustably repositioned in the circumferential direction to alter one end limit of the permitted range of focus ring rotation.

REFERENCES:
patent: 4139268 (1979-02-01), Litman
patent: 4166675 (1979-09-01), Kanno

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