Depth of Field

• Depth of Field is basically: How much blur can be allowed until it becomes objectionable?
• Zeiss formula for Circle of Confusion: c = d/1730, d is the size of the image sensor

The value 1730 is by measurement using a 35 mm camera, but it can change.

• Longer focal length: lower DoF
• Larger aperture: lower DoF
• Larger distance between subject and background: lower DoF

Analysis by Math

• Point Spread Function | Fourier Transform | Optical Transfer Function | Convolution
  • More read: https://photo.stackexchange.com/a/106181