DOFとは?
光学系で, 特に映画や写真に関連するものとして, the optical phenomenon known as 被写界深度 (自由度), は焦点面についての距離です (POF) オブジェクトが画像内で許容できるほどシャープに見える場所. 光学イメージング システムは、一度に 1 つの平面にのみ正確に焦点を合わせることができますが、, the decrease in sharpness is gradual on each side of the POF, so that within the DOF the unsharpness is imperceptible under normal viewing conditions.
ある場合には, it may be desirable to have the entire image sharp, and a large DOF is appropriate. In other cases, a small DOF may be more effective, emphasizing the subject while de-emphasizing the foreground and background. In cinematography, a large DOF is often called deep focus, and a small DOF is often called shallow focus.
