GB475590A - Improvements in and relating to exposure meters for photographic and cinematographic purposes - Google Patents
Improvements in and relating to exposure meters for photographic and cinematographic purposesInfo
- Publication number
- GB475590A GB475590A GB1662736A GB1662736A GB475590A GB 475590 A GB475590 A GB 475590A GB 1662736 A GB1662736 A GB 1662736A GB 1662736 A GB1662736 A GB 1662736A GB 475590 A GB475590 A GB 475590A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- exposure
- photographic
- diffusing screen
- scene
- 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
- 239000011521 glass Substances 0.000 abstract 1
- 239000011022 opal Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
475,590. Exposure meters. SMETHURST, P. C. June 15, 1936, Nos. 16627 and 23573. [Class 98 (i)] In order to judge a photographic exposure in accordance with the " high lights " of the scene, the light incident upon it is measured, by pointing towards the illuminant, from a position adjacent to the scene, an exposure meter which includes in front of the light sensitive element a translucent plate made of a substantially perfect light diffuser such as opal glass. A lens, stop, or filter may be introduced between the diffusing screen and light-sensitive element, or the diffusing screen itself may be tinted. The function of the diffusing screen is to integrate the light falling on it from different directions and the screen will, for the purpose set forth, be flat and unobstructed on the side on which the incident light falls ; the first Provisional Specification refers to other shapes, e.g. ellipsoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1662736A GB475590A (en) | 1936-06-15 | 1936-06-15 | Improvements in and relating to exposure meters for photographic and cinematographic purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1662736A GB475590A (en) | 1936-06-15 | 1936-06-15 | Improvements in and relating to exposure meters for photographic and cinematographic purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB475590A true GB475590A (en) | 1937-11-23 |
Family
ID=10080727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1662736A Expired GB475590A (en) | 1936-06-15 | 1936-06-15 | Improvements in and relating to exposure meters for photographic and cinematographic purposes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB475590A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766654A (en) * | 1947-09-30 | 1956-10-16 | Gen Electric | Exposure meter with incident light attachment |
-
1936
- 1936-06-15 GB GB1662736A patent/GB475590A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766654A (en) * | 1947-09-30 | 1956-10-16 | Gen Electric | Exposure meter with incident light attachment |
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