Traditional Culture Encyclopedia - Photography and portraiture - Who can tell me the conversion formula of depth of field?

Who can tell me the conversion formula of depth of field?

let me explain to the first floor what depth of field is-depth of field refers to the distance range of an object measured in front of a camera lens or other imager along the axis of the imaging depth-of-field machine that can obtain a clear image.

the following is the formula for calculating the depth of field. Where: Δ —— allowable circle diameter f—— lens focal length F—— shooting aperture value L—— focusing distance ΔL1—— foreground depth ΔL2—— back depth of field ΔL—— depth of field Δ L1 = f δ L 2/(f 2+f δ L) (1)

back depth of field Δ L2 = f δ L.