英语词汇“actinic focus”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

actinic focus n. Photography and Optics (now rare) (with reference to a lens or other optical system) the focal point (focal point n. 1a) or focal distance for actinic light; = chemical focus n. at chemical adj. and n. Compounds 3.If chromatic aberration has not been corrected, the actinic focus may differ from the focus of visible light.

ΚΠ

1848 Art-union May 134/3 Having observed the point at which the most perfect picture is visible, it is necessary to..shorten the focus very slightly to bring the tablet to the actinic 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.

1901 Photo-miniature Oct. 304 In these [lenses] the difference between the visual and the actinic focus was often twelve inches or more.

1971 Technol. & Culture 12 193 Rutherford located the photographic plate at the actinic focus of the telescope, ⁷/ ₁₀ inches outside the visual focus.

单词	actinic focus
释义	> as lemmas actinic focus actinic focus n. Photography and Optics (now rare) (with reference to a lens or other optical system) the focal point (focal point n. 1a) or focal distance for actinic light; = chemical focus n. at chemical adj. and n. Compounds 3.If chromatic aberration has not been corrected, the actinic focus may differ from the focus of visible light. ΚΠ 1848 Art-union May 134/3 Having observed the point at which the most perfect picture is visible, it is necessary to..shorten the focus very slightly to bring the tablet to the actinic 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. 1901 Photo-miniature Oct. 304 In these [lenses] the difference between the visual and the actinic focus was often twelve inches or more. 1971 Technol. & Culture 12 193 Rutherford located the photographic plate at the actinic focus of the telescope, ⁷/ ₁₀ inches outside the visual focus. extracted from actinicadj. < as lemmas
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