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focal length
noun
- the distance from a focal point of a lens or mirror to the corresponding principal plane. : f
- the distance between an object lens and its corresponding focal plane in a telescope.
focal length
noun
- the distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens
focal length
/ fō′kəl /
- The distance between the optical center of a lens or mirror to its focal point .
Word History and Origins
Origin of focal length1
Example Sentences
It’s up to me then to define the focal length and the background and the angles, but it’s all based on his design.
"They have a fixed focal length, a fixed size. They are made from materials that give you the lensing property you want, but they don't really have any dynamic characteristics."
The lens was so heavy that he had to screw it into his tripod, and when he aimed at a wall in his apartment, the distance was too short for the focal length.
The museum includes a camera the C.I.A. built for Mr. Tolkachev, with a fixed focal length to ensure his pictures would be less blurry.
This also allows Apple to crop the sensor in different ways to deliver true 2x zoom at a 48mm focal length.
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