Examples of focal length in a Sentence
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To calculate the all-important usable magnification, divide the focal length of the telescope by the focal length of the eyepiece.
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Jamie Carter, Space.com, 30 Nov. 2025
Consider Zone focusing: A favorite of street photographers, Zone focusing means using the aperture in conjunction with the lens's focal length to control the depth of field and create a zone that will be in focus.
—Scott Gilbertson, Wired News, 15 Nov. 2025
In their experiments, the researchers showed that the plasma lens could focus light across a wide range of XUV wavelengths, with its focal length adjustable by tuning the plasma density.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
The macro photos can be shot as 48-megapixel files, but all the other focal lengths have smaller sensors due to the cropping.
—Jakob Schiller, Outside, 23 Sep. 2025
See All Example Sentences for focal length
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Jamie Carter, Space.com, 30 Nov. 2025
Consider Zone focusing: A favorite of street photographers, Zone focusing means using the aperture in conjunction with the lens's focal length to control the depth of field and create a zone that will be in focus.
—Scott Gilbertson, Wired News, 15 Nov. 2025
In their experiments, the researchers showed that the plasma lens could focus light across a wide range of XUV wavelengths, with its focal length adjustable by tuning the plasma density.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
The macro photos can be shot as 48-megapixel files, but all the other focal lengths have smaller sensors due to the cropping.
—Jakob Schiller, Outside, 23 Sep. 2025
See All Example Sentences for focal length
Cite this Entry
“Focal length.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20length. Accessed 17 Dec. 2025.
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focal length
noun
: the distance of a focus from the surface of a lens or concave mirror
—symbol f
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