actinograph
Sign in to saveright|thumb|300px|Hurter & Driffield's actinograph right|thumb|300px|Description of R. Hunt's actinograph
Article
2 sectionsContents
- See also
- References
right|thumb|300px|Hurter & Driffield's actinograph right|thumb|300px|Description of R. Hunt's actinograph
An actinograph is an instrument for measuring or estimating the amount of light available, in terms of its ability to expose photographic film. That is, it measures the actinic or chemical intensity of light, as opposed to radiometric or photometric amount of light.