WordReference Random House Unabridged Dictionary of American English © 2025
back′ fo′cus, [Photog.]
  1. Photographythe distance between the back surface of a lens and the focal plane when the lens is focused at infinity.
  • 1895–1900

'back focus' also found in these entries (note: many are not synonyms or translations):
retrofocus lens

Forum discussions with the word(s) "back focus" in the title:


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