Definition of back focus in English:

back focus

Syllabification: back fo·cus

noun

Photography
  • The distance between the back of a lens and the image of an object at infinity.
    More example sentences
    • If the focal length is positive and the back focus B is longer than the focal length, the result is a reversed telephoto, or retrofocus.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody