Viewfinder capable of adjusting diopter

Details Viewfinder capable of adjusting diopter Viewfinder capable of adjusting diopter

1979-03-13

1980-08-12

Hix, L. T.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350175E, 351 34, 354199, G02C 708, G02C 714, G03B 1302

Patent

active

042170486

ABSTRACT:
An improved eyepiece for a viewfinder of a single lens reflex camera is provided. This improved eyepiece is capable of adjusting both the diopter and astigmatism correction to the demands of the individual user. The eyepiece includes a negative meniscus lens element convex to the object side and a stationary positive lens element. As the negative lens element is movable along the optical axis it adjusts the diopter of the viewfinder. A pair of relatively rotatable prisms is capable of providing variable astigmatism correction.

REFERENCES:
patent: 1680534 (1928-08-01), Garbutt et al.
patent: 2503789 (1950-04-01), Wood et al.
patent: 3240107 (1966-03-01), Prister
patent: 3695750 (1972-10-01), Baker
patent: 3926504 (1975-12-01), Fleischman
patent: 4113363 (1978-09-01), Humphrey
patent: 4145108 (1979-03-01), Itaya
American Journal of Opthalmology vol. 48 No. I (Part II) 7/1959 pp. 118-121. _

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