| 单词 | chemical focus |
| 释义 | > as lemmaschemical focus chemical focus n. Photography and Optics (now rare) the point or distance at which a lens or optical instrument focuses light so as to expose a photographic film.If chromatic aberration has not been corrected, chemical focus may differ from visual focus. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > meeting point focus1664 visual point1679 focal point1713 chemical focus1841 point focus1908 1841 R. Hunt Pop. Treat. Art Photogr. 29 A few experiments will prove the advantage of using, what may be called for want of better terms, the chemical instead of the luminous focus. 1890 W. E. Woodbury Encycl. Photogr. 293 Unless the lens be rendered achromatic, the actinic or chemical focus does not coincide with the visual focus. 1951 M. L. Wolf Dict. Arts 8 Achromatic, in photography, the term describing a lens that has been so adjusted as to allow good representation in two colors. At this point in the adjustment, the visual focus and chemical focus coincide. < as lemmas |
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