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back focus

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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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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of back focus

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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