back focus

noun Photography.

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

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What does “barren” mean?
a cylindrical wooden container with slightly bulging sides.
Worn down by dullness, tedious repetition.
unproductive; unfruitful
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Origin of back focus

First recorded in 1895–1900

Words nearby back focus

backfit, backflash, backflip, back float, backflow, back focus, back foot, back formation, back forty, back four, backgammon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020