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f-system

American  
[ef-sis-tuhm] / ˈɛfˌsɪs təm /

noun

Optics, Photography.

  1. a system that indicates the relative aperture of a camera lens based on the f-number.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.