Close-up photography device

Details Close-up photography device Close-up photography device

1989-08-03

1991-12-31

Brown, Brian W.

Optical: systems and elements

Prism

With reflecting surface

354286, 35428911, 359694, G03B 118

Patent

active

050775693

ABSTRACT:
A close-up photography device includes an intermediate device of extensible and retractable type adapted to be mounted on a camera body, and a lens barrel for close-up photography adapted to be mounted on the intermediate device and arranged to be able to vary at least a focal length for variable-magnification photography. The intermediate device has a first moving member arranged to move according to the amount of extension or retraction. The lens barrel has a second moving member arranged to move to vary the focal length. The first moving member and the second moving member are arranged to be interlocked with each other when the lens barrel is mounted on the intermediate device. An interlocking relation between the first moving member and the second moving member are set so that the focal length of the lens barrel is varied so as not to change a focusing state at an image forming position of the camera body by the extension or retraction of the intermediate device.

REFERENCES:
patent: 4792822 (1988-12-01), Akiyama et al.
patent: 4831396 (1989-05-01), Hiesinger et al.
patent: 4870436 (1989-09-01), Tanaka
patent: 4894672 (1990-01-01), Tanaka

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