FR760136A - Photometer for determining the exposure time when taking photographs - Google Patents
Photometer for determining the exposure time when taking photographsInfo
- Publication number
- FR760136A FR760136A FR760136DA FR760136A FR 760136 A FR760136 A FR 760136A FR 760136D A FR760136D A FR 760136DA FR 760136 A FR760136 A FR 760136A
- Authority
- FR
- France
- Prior art keywords
- photometer
- determining
- exposure time
- taking photographs
- photographs
- 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
- 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
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
- G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Eye Examination Apparatus (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH133041D DE630291C (en) | 1932-08-31 | 1932-08-31 | Light meter |
Publications (1)
Publication Number | Publication Date |
---|---|
FR760136A true FR760136A (en) | 1934-02-16 |
Family
ID=7176766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR760136D Expired FR760136A (en) | 1932-08-31 | 1933-08-28 | Photometer for determining the exposure time when taking photographs |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE630291C (en) |
FR (1) | FR760136A (en) |
-
1932
- 1932-08-31 DE DEH133041D patent/DE630291C/en not_active Expired
-
1933
- 1933-08-28 FR FR760136D patent/FR760136A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE630291C (en) | 1936-05-25 |
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