728 m
Hyperfocal distance
364 m
Sharp from (focused at hyperfocal)
614 mm f/16.9
Full-frame equivalent
4°
Diagonal angle of view
Depth of field by subject distance#
400 mm at f/11 on APS-C (23.5×15.6 mm), circle of confusion 20 µm. “Background blur” is the size of an out-of-focus light at infinity as a percentage of frame width.
| Focus distance | Near limit | Far limit | Total DoF | Front / behind | Background blur |
|---|---|---|---|---|---|
| 1.00 m (3.28 ft) | 99.9 cm | 1.00 m | 0.2 cm | 50% / 50% | 103.16% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.5 cm | 50% / 50% | 56.27% |
| 2.00 m (6.56 ft) | 2.00 m | 2.00 m | 0.9 cm | 50% / 50% | 38.68% |
| 3.00 m (9.84 ft) | 2.99 m | 3.01 m | 2.1 cm | 50% / 50% | 23.81% |
| 4.00 m (13.1 ft) | 3.98 m | 4.02 m | 4.0 cm | 50% / 50% | 17.19% |
| 5.00 m (16.4 ft) | 4.97 m | 5.03 m | 6.3 cm | 50% / 50% | 13.46% |
| 7.00 m (23.0 ft) | 6.94 m | 7.06 m | 12.7 cm | 50% / 50% | 9.38% |
| 10.0 m (32.8 ft) | 9.87 m | 10.1 m | 26.4 cm | 49% / 51% | 6.45% |
| 15.0 m (49.2 ft) | 14.7 m | 15.3 m | 60.2 cm | 49% / 51% | 4.24% |
| 20.0 m (65.6 ft) | 19.5 m | 20.6 m | 1.08 m | 49% / 51% | 3.16% |
| 30.0 m (98.4 ft) | 28.8 m | 31.3 m | 2.45 m | 48% / 52% | 2.09% |
| 50.0 m (164 ft) | 46.8 m | 53.7 m | 6.85 m | 47% / 53% | 1.25% |
| 100 m (328 ft) | 88.0 m | 116 m | 27.9 m | 43% / 57% | 0.62% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
400 mm at other apertures (subject at 3 m)#
Other focal lengths at f/11#
Same lens settings on other formats#
When to use it#
At f/11, a 400 mm lens on APS-C is a natural choice for landscapes and architecture where front-to-back sharpness matters. Focused at 3 m you get 2.1 cm of sharp zone; for maximum front-to-back sharpness focus at 728 m and everything from 364 m to infinity will be acceptably sharp.
See also the f/11 aperture guide.
Frequently asked questions#
What is the depth of field of a 400mm lens at f/11?
On APS-C, focused at 3 m, it is 2.1 cm; at 1 m it is 0.2 cm.
What is the hyperfocal distance for 400mm f/11?
728 m (2387 ft) on APS-C. Everything from 364 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources