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单词 focal aperture
释义

Definition of focal aperture in English:

focal aperture

noun
Optics Photography

  • 1The aperture at the focal plane of a telescope or other optical instrument (now rare).

  • 2A measure of the light-collecting power of a lens, telescope, etc.

Origin

Mid 19th century; earliest use found in The Civil Engineer and Architect's Journal.

Definition of focal aperture in US English:

focal aperture

noun
Optics Photography

  • 1The aperture at the focal plane of a telescope or other optical instrument (now rare).

  • 2A measure of the light-collecting power of a lens, telescope, etc.

Origin

Mid 19th century; earliest use found in The Civil Engineer and Architect's Journal.
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更新时间：2025/7/4 20:17:13