f-number

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f-number

, f number
Photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture
References in periodicals archive ?
8 mm (~11 mm) Applicable Camera 1/3", 1/2", 2/3" Mount C-Mount (adjustable lens position) Focal Length 16 mm Maximum Relative Aperture 1:1.
Designed to achieve an excellent compromise between the demands for high sensitivity (the lens' maximum relative aperture is f 1.
The YJ13x6B series represents a new level of achievement in balancing good sensitivity (this lens' maximum relative aperture is f 2.

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