GB612531A - Improvements in or relating to combined view finders and range finders for photographic cameras - Google Patents
Improvements in or relating to combined view finders and range finders for photographic camerasInfo
- Publication number
- GB612531A GB612531A GB1069146A GB1069146A GB612531A GB 612531 A GB612531 A GB 612531A GB 1069146 A GB1069146 A GB 1069146A GB 1069146 A GB1069146 A GB 1069146A GB 612531 A GB612531 A GB 612531A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame
- range
- lens
- eyepiece
- finder
- 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
Links
Classifications
-
- 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
- G03B13/20—Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Telescopes (AREA)
- Viewfinders (AREA)
Abstract
612,531. View and range-finders for photographic cameras. ROTHSCHILD, W. J. April 6, 1946, No. 101691. [Class 98 (i)] A combined view and range-finder comprises (1) an inverted Galilean telescope with a semireflecting mirror c between the objective a and eyepiece b serving to reflect the rangefinder beam into the eyepiece after this beam has passed through a second negative lens d of the same power as, but smaller than, the objective a and at the same optical distance from the eyepiece b as the objective; (2) a frame k in the range-finder beam at the principal focus of the view-finder eyepiece, and outside the field of the lens d, i.e. in a position such that after reflection in the mirror c the rays of light from all points on the frame emerge as a parallel beam and a virtual image of the frame appears superimposed on the object under observation, the size of the frame being chosen to indicate the correct field of view, and the frame being illuminated by light from the object through an aperture in the camera wall; and (3) means to deflect the range-finder beam according to the focusing movement of the camera lens, or according to a dial marked in distance, which means may be a prism e rotatable about a pivot e<1>, or rotary wedges or a variable angle prism. The frame k may be viewed through a positive annular lens surrounding, and maybe integral with, the lens d, and may be formed by lines engraved on a glass plate into which light is admitted through a polished edge. With interchangeable camera lenses, several interchangeable frames or a multiple frame may be used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1069146A GB612531A (en) | 1946-04-06 | 1946-04-06 | Improvements in or relating to combined view finders and range finders for photographic cameras |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1069146A GB612531A (en) | 1946-04-06 | 1946-04-06 | Improvements in or relating to combined view finders and range finders for photographic cameras |
Publications (1)
Publication Number | Publication Date |
---|---|
GB612531A true GB612531A (en) | 1948-11-15 |
Family
ID=9972509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1069146A Expired GB612531A (en) | 1946-04-06 | 1946-04-06 | Improvements in or relating to combined view finders and range finders for photographic cameras |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB612531A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1045794B (en) * | 1957-01-26 | 1958-12-04 | Adox Fotowerke Dr C Schleussne | Rangefinder with field reflection |
US3041919A (en) * | 1956-12-20 | 1962-07-03 | Agfa Ag | Combined range and view finder |
-
1946
- 1946-04-06 GB GB1069146A patent/GB612531A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3041919A (en) * | 1956-12-20 | 1962-07-03 | Agfa Ag | Combined range and view finder |
DE1045794B (en) * | 1957-01-26 | 1958-12-04 | Adox Fotowerke Dr C Schleussne | Rangefinder with field reflection |
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