: the distance of a focus from the surface of a lens or curved mirror
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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 That’s fancy branding for how the phone uses one high-resolution sensor to simulate multiple focal lengths.—Jennifer Jolly, USA TODAY, 28 Feb. 2025 The cylindrical top section is home to a 3.4-mm wide-angle lens with a focal length of 6.7 mm (45 mm equiv) and a 35-mm telephoto with a focal length of 150 mm (737 mm equiv), the latter made with low-dispersion glass.—New Atlas, 28 Feb. 2025 See All Example Sentences for focal length
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