Finder with focusing indicator

Details Finder with focusing indicator Finder with focusing indicator

1997-12-10

2000-01-04

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Having indicator

396148, G03B 1720

Patent

active

060119284

ABSTRACT:
A plurality of indexes which become references for focusing are successively displayed on a finder in synchronization with an focusing operation of a focus lens, and focusing is performed while the size of the displayed index and the size of the object image are compared with each other, thus simplifying a configuration for focusing. A focusing ring 5 is inscribed with indexes 4a to 4d having sizes substantially corresponding to sizes of an object image at various focal lengths, respectively. Images of the indexes 4a to 4d are displayed in a finder 3 by a deflecting prism 9 attached to an objective lens 7 of the finder 3. A photographer rotates the focusing ring 5 and compares the sizes of the indexes 4a to 4d with the size of the object image observed through the finder 3, and the focusing operation is completed at the time when one of the indexes 4a to 4d that has a size closest to the object image is displayed.

REFERENCES:
patent: 3675558 (1972-07-01), Kuramoto et al.
patent: 4011571 (1977-03-01), Okuzawa

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