: the distance of a focus from the surface of a lens or curved mirror
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The notes in the margins of that shooting script are full of lens focal lengths, camera angles, and distances that were key to the compositions of shots.—Sarah Shachat, IndieWire, 28 Feb. 2026 For planetary observing, refractor telescopes, Dobsonians, Schmidt-Cassegrains, and Maksutov-Cassegrains boast long focal lengths and can accommodate eyepieces that offer high magnifications.—Jamie Carter, Space.com, 26 Feb. 2026 That effect can bring a sense of depth to images, but seeing a full picture clearly typically requires you to combine multiple photographs that were shot at different focal lengths.—Jess Weatherbed, The Verge, 29 Dec. 2025 The depth of field is influenced by the interplay of the aperture, the focal length of the lens, and the position of the subjects within the scene.—Scott Gilbertson, Wired News, 15 Nov. 2025 See All Example Sentences for focal length