Focusing screen

Details Focusing screen Focusing screen

1980-06-20

1982-05-18

Hix, L. T.

350286, G03B 1328

Patent

active

043301886

ABSTRACT:
A focusing screen capable of showing an out-of-focus image in a conspicuous manner has a split prism forming portion on the central portion thereof which consists of a central area and a peripheral area surrounding the central area. Split prisms slanting in different directions are formed in the central and peripheral areas of the split prism forming portion.

REFERENCES:
patent: 3602085 (1971-08-01), Wagner
patent: 4003637 (1977-01-01), Masuoka

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