focal length

noun

: the distance of a focus from the surface of a lens or curved mirror

Examples of focal length in a Sentence

Recent Examples on the Web
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Four of them have a short focal length, which translates to a relatively wide field of view, while the other two have a longer focal length. Mike Wall, Space.com, 13 Mar. 2025 Also, instead of a dedicated telephoto lens, the camera digitally crops into the 48MP sensor to create an optical-quality 2x zoom, effectively giving you a second focal length without adding a physical lens. Jennifer Jolly, USA TODAY, 28 Feb. 2025 The focal length is a short telephoto for the sensor size, with an angle of view that's just about the same as an 85mm full-frame prime. PCMAG, 5 Mar. 2025 The lens also has a focal length of 35mm, which is a more optimum focal length for photography. Ben Sin, Forbes, 3 Mar. 2025 See All Example Sentences for focal length

Word History

First Known Use

1682, in the meaning defined above

Time Traveler
The first known use of focal length was in 1682

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Cite this Entry

“Focal length.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20length. Accessed 26 Mar. 2025.

Kids Definition

focal length

noun
: the distance of a focus from the surface of a lens or inwardly-curved mirror

Medical Definition

focal length

noun
: the distance of a focus from the surface of a lens or concave mirror
symbol f

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