back focus


noun Photography.

the distance between the back surface of a lens and the focal plane when the lens is focused at infinity.

Nearby words

  1. back electromotive force,
  2. back emf,
  3. back emission,
  4. back end,
  5. back float,
  6. back foot,
  7. back formation,
  8. back forty,
  9. back four,
  10. back gear

Origin of back focus

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019