3.8 km
Hyperfocal distance
1.9 km
Sharp from (focused at hyperfocal)
800 mm f/5.6
Full-frame equivalent
3°
Diagonal angle of view
Depth of field by subject distance#
400 mm at f/2.8 on Micro Four Thirds (17.3×13 mm), circle of confusion 15 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) | 100.0 cm | 1.00 m | 0.0 cm | 50% / 50% | 550.51% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.1 cm | 50% / 50% | 300.28% |
| 2.00 m (6.56 ft) | 2.00 m | 2.00 m | 0.2 cm | 50% / 50% | 206.44% |
| 3.00 m (9.84 ft) | 3.00 m | 3.00 m | 0.4 cm | 50% / 50% | 127.04% |
| 4.00 m (13.1 ft) | 4.00 m | 4.00 m | 0.8 cm | 50% / 50% | 91.75% |
| 5.00 m (16.4 ft) | 4.99 m | 5.01 m | 1.2 cm | 50% / 50% | 71.81% |
| 7.00 m (23.0 ft) | 6.99 m | 7.01 m | 2.4 cm | 50% / 50% | 50.05% |
| 10.0 m (32.8 ft) | 9.97 m | 10.0 m | 5.0 cm | 50% / 50% | 34.41% |
| 15.0 m (49.2 ft) | 14.9 m | 15.1 m | 11.5 cm | 50% / 50% | 22.62% |
| 20.0 m (65.6 ft) | 19.9 m | 20.1 m | 20.6 cm | 50% / 50% | 16.85% |
| 30.0 m (98.4 ft) | 29.8 m | 30.2 m | 46.6 cm | 50% / 50% | 11.16% |
| 50.0 m (164 ft) | 49.4 m | 50.7 m | 1.30 m | 49% / 51% | 6.66% |
| 100 m (328 ft) | 97.5 m | 103 m | 5.23 m | 49% / 51% | 3.32% |
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/2.8#
Same lens settings on other formats#
When to use it#
At f/2.8, a 400 mm lens on Micro Four Thirds is a natural choice for portraits and subject isolation. Focused at 3 m you get 0.4 cm of sharp zone; for maximum front-to-back sharpness focus at 3.8 km and everything from 1.9 km to infinity will be acceptably sharp.
See also the f/2.8 aperture guide.
Frequently asked questions#
What is the depth of field of a 400mm lens at f/2.8?
On Micro Four Thirds, focused at 3 m, it is 0.4 cm; at 1 m it is 0.0 cm.
What is the hyperfocal distance for 400mm f/2.8?
3.8 km (12500 ft) on Micro Four Thirds. Everything from 1.9 km to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources