Cinematography13 min read
Why Your Lens Markings and Your DoF Calculator Still Disagree (Breathing, T-Stops, and Diffraction)
Even with the correct circle of confusion set, a DoF calculator will give you a number your lens cannot quite deliver. Lens breathing changes the effective focal length as you focus closer. T-stops differ from f-numbers. And diffraction shrinks your sharp zone past f/8 on modern sensors. Here is what each factor contributes.
Lens BreathingT-StopDepth of Field
