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Canon EF 400mm F2.8L IS III USM — depth of field calculator

The Canon EF 400mm F2.8L IS III USM is a prime lens for the Canon EF (Full Frame DSLR) system with a focal length of 400mm, a maximum aperture of f/2.8 and a minimum aperture of f/22. Below is a ready-to-use depth of field (DoF) calculator and tables for typical shooting distances, computed with the same formulas as the PhotoSim app.

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Key numbers

Depth of field table

Distances are measured from the sensor plane. Each cell shows the near and far limit of acceptable sharpness in metres (∞ = to infinity). Circle of confusion = sensor diagonal / 1500.

ApertureHyperfocal1 m2 m3 m5 m10 m
f/2.81981 m1.00–1.002.00–2.003.00–3.004.99–5.019.95–10.0
f/41387 m1.00–1.002.00–2.002.99–3.014.98–5.029.93–10.1
f/5.6991 m1.00–1.002.00–2.002.99–3.014.98–5.029.90–10.1
f/8694 m1.00–1.002.00–2.002.99–3.014.97–5.039.86–10.1
f/11505 m1.00–1.001.99–2.012.98–3.024.95–5.059.81–10.2
f/16347 m1.00–1.001.99–2.012.98–3.024.93–5.079.73–10.3
f/22253 m1.00–1.001.99–2.012.97–3.034.91–5.099.63–10.4

FAQ

What is the depth of field of the Canon EF 400mm F2.8L IS III USM at f/2.8 and 3 m?

At 400mm, f/2.8 and focus at 3 m, acceptable sharpness runs from 3.00 to 3.00 m — about 1 cm in total.

What is the hyperfocal distance of the Canon EF 400mm F2.8L IS III USM?

At 400mm and f/8 on a Full Frame sensor the hyperfocal distance is about 694 m. Focus there and everything from 347 m to infinity is sharp.

How do I get more background blur with the Canon EF 400mm F2.8L IS III USM?

Open the aperture to f/2.8, move closer to your subject and increase the distance between subject and background. You can check the result in the calculator above.

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