How depth of field is worked out
Viewfinder uses the exact thin-lens formulas with a circle of confusion chosen by the recording mode's size. It reads the marked T-stop, so it shows a little more depth than the true f-number would.
- Tap the focus read-out at the end of the info strip to open the Depth of Field panel.
- Set the Focus distance with the slider, or tap Hyperfocal to focus at the mark that holds everything sharp to infinity.
- Set the Working stop with the wheel, or the plus and minus buttons, a third of a stop at a time. FROM LENS means the stop is the one the lens declares; tap Lens to go back to it after a change.
- Leave the format on AUTO, or choose S16, S35, FF or 65 to set the circle of confusion yourself.
The panel shows the near and far limits and the total. When everything to infinity is sharp, it says so and gives the hyperfocal distance. With Show the band under the frame on, a thin band under the picture draws the sharp zone as you frame.
The circle of confusion follows the mode: 0.015 mm for Super 16 and Micro Four Thirds, 0.025 for Super 35, 0.030 for full frame and large format, 0.042 for 65. Very small gates use their diagonal divided by 1,500. Distances are in meters or feet, set with the two chips beside the panel's title or in Settings, Distances.
To work the numbers out away from the app, use the depth of field calculator.
If that didn't work
Expect the figures to run 5 to 15 percent deep, because a T-stop is slower than its f-number. The squeeze of an anamorphic lens and focus breathing are not modeled; on an anamorphic lens the panel says the squeeze is not applied.
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Updated November 2, 2026