An f-number is a measure of the light-gathering ability of an optical system such as a camera lens.

The f/# (pronounced “F-number”) setting on a lens controls overall light throughput, depth of field (DOF), and the ability to produce contrast at a given resolution. Fundamentally, f/# is the ratio …

Numerical aperture (NA) refers to the cone of light that is made from a focusing lens and describes the light gathering capability of the lens (similar to f/# ). NA is defined by the …

What is an f-number (ƒ/#)? An f‑number (ƒ/#) or f‑stop refers to the ratio of a lens’s focal length to its aperture diameter and indicates the amount of light coming through the lens. F-numbers …

2025年3月31日 · The f-number, also known as the focal ratio or f-ratio, relates the focal length of a lens to the diameter of its aperture. It is expressed as a ratio: f/N, where f is the focal length …

The f-number of an object is the ratio of focal length and aperture diameter, and used for indirectly indicating the aperture size. Large numbers imply small apertures, leading to reduced light …

2024年12月26日 · What Is The F Number? The f number, or f-stop, is a quantitative measure of the aperture opening in a camera lens, indicating the amount of light that passes through the …

In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture [1]) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of …

F-number DEFINITION: The inverse number of a relative aperture. The value obtained by dividing the focal length by the effective aperture. DESCRIPTION: F-number (F) is expressed by the …

2023年6月12日 · The f-number (also known as the f-stop) is a dimensionless value that represents the ratio of a lens’s focal length to the diameter of the aperture opening. It …