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focus(ing) ring的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
名詞 focus:
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the concentration of attention or energy on something
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maximum clarity or distinctness of an image rendered by an optical system
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maximum clarity or distinctness of an idea
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a central point or locus of an infection in an organism
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special emphasis attached to something
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a point of convergence of light (or other radiation) or a point from which it diverges
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a fixed reference point on the concave side of a conic section
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direct one's attention on something
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cause to converge on or toward a central point
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bring into focus or alignment; to converge or cause to converge; of ideas or emotions
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become focussed or come into focus
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put (an image) into focus
