Depth diffraction lab

Depth of field is geometry, not a number. Most calculators hand you two figures and a shrug. Depth Lab draws the light path — and then lets you grab it. THE DIAGRAM IS THE CONTROL Drag the subject sideways and the sharp band slides with it. Pull the focus plane and the near and far limits follow in real time. Drag the aperture ring and the cone of light visibly narrows. No form to fill in: the drawing is the input, and six readings above it update every frame — near limit, far limit, total depth, hyperfocal distance, magnification and frame width at the subject. Lock two of the three controls and the third becomes an answer: name the near limit you need, and the app tells you where to focus. TWO LIGHT PATHS AT ONCE Tap A|B and the screen splits: one scene at two settings, sharing a distance scale, with a difference table reading out near, far, total, hyperfocal, magnification and…