Photography – With exposure objective focusing means – focusing aid – or... – Dual purpose photoelement
Patent
1996-08-22
1998-02-24
Adams, Russell E.
Photography
With exposure objective focusing means, focusing aid, or...
Dual purpose photoelement
396111, G03B 310
Patent
active
057219788
ABSTRACT:
In a distance measuring apparatus, a light-detecting portion in a trigonometric distance measuring apparatus using a passive method is also used as a light-detecting portion for photometry processing. Thus, the luminance range for distance measurement is widened. The distance measuring apparatus includes two light-detecting portions arranged in correspondence with two optical systems. Correction filters for luminous efficacy correction is arranged in the optical paths of each optical system covering halves of the corresponding light-detecting portions.
REFERENCES:
patent: 4191882 (1980-03-01), Sato
patent: 4606630 (1986-08-01), Haruki et al.
Adams Russell E.
Fuji Photo Optical Co., Ltd.
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