模糊圈越大景深越深

index.js

var cocs = [0.014, 0.019, 0.029]
var dofs = []

var distance = 1000
var focal = 50
var f_number = 2.8

for (let i = 0; i <= cocs.length - 1; i++) {
    let coc = cocs[i]
    let farPoint  = (distance * Math.pow(focal, 2)) / (Math.pow(focal, 2) - (f_number * coc * distance))
    let nearPoint = (distance * Math.pow(focal, 2)) / (Math.pow(focal, 2) + (f_number * coc * distance))
    let dof       = farPoint - nearPoint
    dofs.push({ coc: coc, dof: dof })
}

// [
//   {
//     "coc": 0.014,
//     "dof": 31.367712140989397
//   },
//   {
//     "coc": 0.019,
//     "dof": 42.57928153372279
//   },
//   {
//     "coc": 0.029,
//     "dof": 65.02860194963807
//   }
// ]