GB784213A - Device for sharp focussing in photographic apparatus - Google Patents

Device for sharp focussing in photographic apparatus

Info

Publication number
GB784213A
GB784213A GB3178153A GB3178153A GB784213A GB 784213 A GB784213 A GB 784213A GB 3178153 A GB3178153 A GB 3178153A GB 3178153 A GB3178153 A GB 3178153A GB 784213 A GB784213 A GB 784213A
Authority
GB
United Kingdom
Prior art keywords
focusing
lens
opaque
rays
testing object
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3178153A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JOSEPH VON BERG
Original Assignee
JOSEPH VON BERG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JOSEPH VON BERG filed Critical JOSEPH VON BERG
Priority to GB3178153A priority Critical patent/GB784213A/en
Publication of GB784213A publication Critical patent/GB784213A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens
    • G03B13/26—Focusing screens with magnifiers for inspecting image formed on screen

Abstract

784,213. Focusing devices. BERG, J. VON. Nov. 16, 1953, No. 31781/53. Classes 97(1) and 98(1) A device for sharp focusing in photographic apparatus comprises deflecting means extending into and transversely of the path of a pencil of light rays and effective to divide the rays into at least two parts at different angles to the optical axis, and a testing object formed as an opaque plate with a transparent portion in the path of the deflected rays, so that upon accurate focusing of the lens of the photographic apparatus the partial images of the testing object are united to form a single image. As shown the testing object may be an opaque plate 1 with a transparent rectangular aperture 2 or a transparent foil made opaque except for a rectangular area and having opaque stripes therein parallel to the longitudinal direction of said area while the deflecting means are wedge prisms 6, 7, the separate slit images being projected by the lens 3 on to a plane e<SP>1</SP>. A light tunnel is also provided. The device is applicable to projection printing apparatus and to cameras having focusing screens, including reflex and twin lens cameras, the two slit images being projected on to the subject to be photographed.
GB3178153A 1953-11-16 1953-11-16 Device for sharp focussing in photographic apparatus Expired GB784213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3178153A GB784213A (en) 1953-11-16 1953-11-16 Device for sharp focussing in photographic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3178153A GB784213A (en) 1953-11-16 1953-11-16 Device for sharp focussing in photographic apparatus

Publications (1)

Publication Number Publication Date
GB784213A true GB784213A (en) 1957-10-09

Family

ID=10328318

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3178153A Expired GB784213A (en) 1953-11-16 1953-11-16 Device for sharp focussing in photographic apparatus

Country Status (1)

Country Link
GB (1) GB784213A (en)

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