: the distance of a focus from the surface of a lens or curved mirror
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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 Even though the aperture opens to f/1.4, the 12mm focal length simply doesn't provide enough compression for the effect when taking photos with a distant focus point.—PC Magazine, 23 Sep. 2025 The company has been testing several new features, including major upgrades to video recording and a variable aperture system to give users more control over focal length.—Bloomberg, Mercury News, 9 Sep. 2025 See All Example Sentences for focal length
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