Definition of back focus in English:

back focus

Syllabification: back fo·cus


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.

Definition of back focus in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
cause (someone) to lose confidence or hope