Focal ratio
volume
British pronunciation/fˈəʊkəl ɹˈeɪʃɪˌəʊ/
American pronunciation/fˈoʊkəl ɹˈeɪʃɪˌoʊ/

Definice a Význam "focal ratio"

01

the ratio of the focal length to the diameter of a (camera) lens system

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