13.4 m
Hyperfocal distance
6.68 m
Sharp from (focused at hyperfocal)
40 mm f/4.0
Full-frame equivalent
57°
Diagonal angle of view
Depth of field by subject distance#
20 mm at f/2 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) | 29.4 cm | 30.6 cm | 1.3 cm | 49% / 51% | 4.13% |
| 50.0 cm (1.64 ft) | 48.3 cm | 51.9 cm | 3.6 cm | 48% / 52% | 2.41% |
| 75.0 cm (2.46 ft) | 71.1 cm | 79.3 cm | 8.2 cm | 47% / 53% | 1.58% |
| 1.00 m (3.28 ft) | 93.2 cm | 1.08 m | 14.8 cm | 46% / 54% | 1.18% |
| 1.50 m (4.92 ft) | 1.35 m | 1.69 m | 33.7 cm | 44% / 56% | 0.78% |
| 2.00 m (6.56 ft) | 1.74 m | 2.35 m | 60.7 cm | 43% / 57% | 0.58% |
| 3.00 m (9.84 ft) | 2.45 m | 3.86 m | 1.41 m | 39% / 61% | 0.39% |
| 4.00 m (13.1 ft) | 3.08 m | 5.70 m | 2.62 m | 35% / 65% | 0.29% |
| 5.00 m (16.4 ft) | 3.64 m | 7.98 m | 4.34 m | 31% / 69% | 0.23% |
| 7.00 m (23.0 ft) | 4.59 m | 14.7 m | 10.1 m | 24% / 76% | 0.17% |
| 10.0 m (32.8 ft) | 5.72 m | 39.8 m | 34.0 m | 13% / 87% | 0.12% |
| 15.0 m (49.2 ft) | 7.06 m | ∞ | ∞ | — | 0.08% |
| 20.0 m (65.6 ft) | 8.00 m | ∞ | ∞ | — | 0.06% |
| 30.0 m (98.4 ft) | 9.24 m | ∞ | ∞ | — | 0.04% |
| 50.0 m (164 ft) | 10.5 m | ∞ | ∞ | — | 0.02% |
| 100 m (328 ft) | 11.8 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/2#
Same lens settings on other formats#
When to use it#
At f/2, a 20 mm lens on Micro Four Thirds is a natural choice for environmental portraits, street and low light. Focused at 3 m you get 1.41 m of sharp zone; for maximum front-to-back sharpness focus at 13.4 m and everything from 6.68 m to infinity will be acceptably sharp.
See also the f/2 aperture guide.
Frequently asked questions#
What is the depth of field of a 20mm lens at f/2?
On Micro Four Thirds, focused at 3 m, it is 1.41 m; at 1 m it is 14.8 cm.
What is the hyperfocal distance for 20mm f/2?
13.4 m (43.8 ft) on Micro Four Thirds. Everything from 6.68 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources