back focus; focus behind the subject
Photography term: the lens is focused on a point behind the intended subject, leaving the subject itself out of focus. Contrasts with 前ピン (front focus).
See also: ピント
This photo has back focus, so the person is blurred.
To fix back focus, adjust the focus forward.
Standard kanji-katakana spelling for this photography term.
All-katakana spelling, common in casual or technical contexts.
Compound of 後 (あと, 'behind') and ピン, a clipping of ピント ('focus'). The term likely arose in photography circles to describe a common focusing mistake.