What does focal ratio mean?

Here's a list of possible definitions for the term focal ratio:

Princeton's WordNet

  1. focal ratio, f number, stop number, speed(noun)

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

ChatGPT

  1. focal ratio

    The focal ratio, also known as f-number, f-stop, or relative aperture, is a dimensionless number that quantifies the ratio of the focal length of a lens to the diameter of the entrance pupil or aperture. It is a measure of lens speed, describing the brightness of the image that will be formed for a given exposure time. A smaller f-number denotes a larger aperture, which allows more light to reach the image sensor, ideal for low-light conditions. Conversely, a larger f-number denotes a smaller aperture, providing a wider depth of field.

Matched Categories

Numerology

  1. Chaldean Numerology

    The numerical value of focal ratio in Chaldean Numerology is: 1

  2. Pythagorean Numerology

    The numerical value of focal ratio in Pythagorean Numerology is: 1


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