6.69 m
Hyperfocal distance
3.34 m
Sharp from (focused at hyperfocal)
40 mm f/8.0
Full-frame equivalent
57°
Diagonal angle of view
Depth of field by subject distance#
20 mm at f/4 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 |
|---|---|---|---|---|---|
| 30.0 cm (0.98 ft) | 28.8 cm | 31.3 cm | 2.5 cm | 48% / 52% | 2.06% |
| 50.0 cm (1.64 ft) | 46.6 cm | 53.9 cm | 7.2 cm | 46% / 54% | 1.20% |
| 75.0 cm (2.46 ft) | 67.6 cm | 84.2 cm | 16.6 cm | 45% / 55% | 0.79% |
| 1.00 m (3.28 ft) | 87.2 cm | 1.17 m | 30.0 cm | 43% / 57% | 0.59% |
| 1.50 m (4.92 ft) | 1.23 m | 1.93 m | 70.1 cm | 39% / 61% | 0.39% |
| 2.00 m (6.56 ft) | 1.54 m | 2.84 m | 1.30 m | 35% / 65% | 0.29% |
| 3.00 m (9.84 ft) | 2.07 m | 5.42 m | 3.35 m | 28% / 72% | 0.19% |
| 4.00 m (13.1 ft) | 2.50 m | 9.93 m | 7.42 m | 20% / 80% | 0.15% |
| 5.00 m (16.4 ft) | 2.86 m | 19.8 m | 16.9 m | 13% / 87% | 0.12% |
| 7.00 m (23.0 ft) | 3.42 m | ∞ | ∞ | — | 0.08% |
| 10.0 m (32.8 ft) | 4.00 m | ∞ | ∞ | — | 0.06% |
| 15.0 m (49.2 ft) | 4.62 m | ∞ | ∞ | — | 0.04% |
| 20.0 m (65.6 ft) | 5.00 m | ∞ | ∞ | — | 0.03% |
| 30.0 m (98.4 ft) | 5.46 m | ∞ | ∞ | — | 0.02% |
| 50.0 m (164 ft) | 5.88 m | ∞ | ∞ | — | 0.01% |
| 100 m (328 ft) | 6.25 m | ∞ | ∞ | — | 0.01% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
20 mm at other apertures (subject at 3 m)#
Other focal lengths at f/4#
| Focal length | Subject at | Total DoF |
|---|---|---|
| 14 mm | 3.00 m | 33.3 m |
| 16 mm | 3.00 m | 8.21 m |
| 20 mm | 3.00 m | 3.35 m |
| 24 mm | 3.00 m | 2.06 m |
| 28 mm | 3.00 m | 1.44 m |
| 35 mm | 3.00 m | 89.0 cm |
| 40 mm | 3.00 m | 67.4 cm |
| 50 mm | 3.00 m | 42.7 cm |
| 85 mm | 3.00 m | 14.5 cm |
| 105 mm | 3.00 m | 9.5 cm |
| 135 mm | 3.00 m | 5.7 cm |
| 200 mm | 10.0 m | 29.4 cm |
| 300 mm | 10.0 m | 12.9 cm |
| 400 mm | 10.0 m | 7.2 cm |
| 600 mm | 10.0 m | 3.1 cm |
Same lens settings on other formats#
When to use it#
At f/4, a 20 mm lens on Micro Four Thirds is a natural choice for general photography. Focused at 3 m you get 3.35 m of sharp zone; for maximum front-to-back sharpness focus at 6.69 m and everything from 3.34 m to infinity will be acceptably sharp.
See also the f/4 aperture guide.
Frequently asked questions#
What is the depth of field of a 20mm lens at f/4?
On Micro Four Thirds, focused at 3 m, it is 3.35 m; at 1 m it is 30.0 cm.
What is the hyperfocal distance for 20mm f/4?
6.69 m (21.9 ft) on Micro Four Thirds. Everything from 3.34 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources