Circle of confusion guide
Circle of Confusion Calculator for Depth of Field
Circle of confusion is the assumption behind depth of field calculations. It defines how large a blur point can be before it no longer looks acceptably sharp.
Fast answer: Simple DoF Calculator includes camera and format support plus circle of confusion values, so most users can choose a camera instead of calculating CoC manually.
Why circle of confusion matters
Depth of field is not only about the lens. Camera format, display size, viewing distance and sharpness expectations all affect what counts as sharp. The circle of confusion value turns those assumptions into a usable calculation.
How to handle it in the app
- Select the camera, film format or digital format that matches your shoot.
- Let the app use the appropriate circle of confusion value for the calculation.
- Enter focal length, aperture and focus distance.
- Use the resulting near and far limits as practical shooting guidance.
Who should care most?
Most photographers can choose their camera and move on. Cinematographers, large-format photographers and technically demanding print workflows may want to understand CoC more deeply.