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focal length

NOUN
  1. the distance from a lens to its focus

How To Use focal length In A Sentence

  • They have exploited this radical abbreviation of focal length to develop a prototype of a credit-card-thin camera.
  • As before, the images were taken with a constant focal length, lighting, aperture, and shutter speed.
  • The short effective focal length provides focused images at distances from lens contact to near infinity, even in air.
  • He discusses camera types, lenses, focal length, flash, light, digital photographs, and film types and speeds.
  • The literal interpretation of the f/N notation for f-number N is as an arithmetic expression for the effective aperture diameter (input pupil diameter), the focal length divided by the f-number: D = f/N. Noooo!!! Further aspiration.
  • Yet Stork determined the probable focal length of a concave mirror made by inverting and silvering the convex mirror shown in the painting.
  • Also still an urban legend: the "helmet-mounted downblouse cam" - I haven't yet figured out the right aperture & focal length to use. Street Justice: Crime and Punishment
  • The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.
  • If you're taking a picture of a mountain range, you might want to use a telephoto lens, a lens with an especially long focal length.
  • When a lens is used to focus the sun's rays onto a piece of paper the distance of the paper from the lens is called the focal length.
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