14.8 m
Hyperfocal distance
7.42 m
Sharp from (focused at hyperfocal)
40 mm f/3.6
Full-frame equivalent
57°
Diagonal angle of view
Depth of field by subject distance#
20 mm at f/1.8 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 |
|---|---|---|---|---|---|
| 30.0 cm (0.98 ft) | 29.4 cm | 30.6 cm | 1.1 cm | 49% / 51% | 4.59% |
| 50.0 cm (1.64 ft) | 48.4 cm | 51.7 cm | 3.2 cm | 48% / 52% | 2.68% |
| 75.0 cm (2.46 ft) | 71.5 cm | 78.9 cm | 7.4 cm | 48% / 52% | 1.76% |
| 1.00 m (3.28 ft) | 93.8 cm | 1.07 m | 13.3 cm | 47% / 53% | 1.31% |
| 1.50 m (4.92 ft) | 1.36 m | 1.67 m | 30.3 cm | 45% / 55% | 0.87% |
| 2.00 m (6.56 ft) | 1.76 m | 2.31 m | 54.4 cm | 43% / 57% | 0.65% |
| 3.00 m (9.84 ft) | 2.50 m | 3.76 m | 1.26 m | 40% / 60% | 0.43% |
| 4.00 m (13.1 ft) | 3.15 m | 5.47 m | 2.32 m | 37% / 63% | 0.32% |
| 5.00 m (16.4 ft) | 3.74 m | 7.53 m | 3.79 m | 33% / 67% | 0.26% |
| 7.00 m (23.0 ft) | 4.76 m | 13.2 m | 8.48 m | 26% / 74% | 0.18% |
| 10.0 m (32.8 ft) | 5.97 m | 30.6 m | 24.7 m | 16% / 84% | 0.13% |
| 15.0 m (49.2 ft) | 7.46 m | ∞ | ∞ | — | 0.09% |
| 20.0 m (65.6 ft) | 8.52 m | ∞ | ∞ | — | 0.06% |
| 30.0 m (98.4 ft) | 9.92 m | ∞ | ∞ | — | 0.04% |
| 50.0 m (164 ft) | 11.4 m | ∞ | ∞ | — | 0.03% |
| 100 m (328 ft) | 12.9 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/1.8#
Same lens settings on other formats#
When to use it#
At f/1.8, 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 1.26 m of sharp zone; for maximum front-to-back sharpness focus at 14.8 m and everything from 7.42 m to infinity will be acceptably sharp.
See also the f/1.8 aperture guide.
Frequently asked questions#
What is the depth of field of a 20mm lens at f/1.8?
On Micro Four Thirds, focused at 3 m, it is 1.26 m; at 1 m it is 13.3 cm.
What is the hyperfocal distance for 20mm f/1.8?
14.8 m (48.7 ft) on Micro Four Thirds. Everything from 7.42 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources