59.3 m
Hyperfocal distance
29.6 m
Sharp from (focused at hyperfocal)
80 mm f/3.6
Full-frame equivalent
30°
Diagonal angle of view
Depth of field by subject distance#
40 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) | 29.9 cm | 30.1 cm | 0.3 cm | 50% / 50% | 19.76% |
| 50.0 cm (1.64 ft) | 49.6 cm | 50.4 cm | 0.8 cm | 50% / 50% | 11.17% |
| 75.0 cm (2.46 ft) | 74.1 cm | 75.9 cm | 1.8 cm | 49% / 51% | 7.24% |
| 1.00 m (3.28 ft) | 98.4 cm | 1.02 m | 3.2 cm | 49% / 51% | 5.35% |
| 1.50 m (4.92 ft) | 1.46 m | 1.54 m | 7.4 cm | 49% / 51% | 3.52% |
| 2.00 m (6.56 ft) | 1.94 m | 2.07 m | 13.2 cm | 48% / 52% | 2.62% |
| 3.00 m (9.84 ft) | 2.86 m | 3.16 m | 30.0 cm | 48% / 52% | 1.74% |
| 4.00 m (13.1 ft) | 3.75 m | 4.29 m | 53.7 cm | 47% / 53% | 1.30% |
| 5.00 m (16.4 ft) | 4.61 m | 5.46 m | 84.3 cm | 46% / 54% | 1.04% |
| 7.00 m (23.0 ft) | 6.26 m | 7.93 m | 1.67 m | 44% / 56% | 0.74% |
| 10.0 m (32.8 ft) | 8.56 m | 12.0 m | 3.46 m | 42% / 58% | 0.52% |
| 15.0 m (49.2 ft) | 12.0 m | 20.1 m | 8.09 m | 37% / 63% | 0.34% |
| 20.0 m (65.6 ft) | 15.0 m | 30.2 m | 15.2 m | 33% / 67% | 0.26% |
| 30.0 m (98.4 ft) | 19.9 m | 60.7 m | 40.8 m | 25% / 75% | 0.17% |
| 50.0 m (164 ft) | 27.1 m | 319 m | 291 m | 8% / 92% | 0.10% |
| 100 m (328 ft) | 37.2 m | ∞ | ∞ | — | 0.05% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
40 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 40 mm lens on Micro Four Thirds is a natural choice for environmental portraits, street and low light. Focused at 3 m you get 30.0 cm of sharp zone; for maximum front-to-back sharpness focus at 59.3 m and everything from 29.6 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 40mm lens at f/1.8?
On Micro Four Thirds, focused at 3 m, it is 30.0 cm; at 1 m it is 3.2 cm.
What is the hyperfocal distance for 40mm f/1.8?
59.3 m (195 ft) on Micro Four Thirds. Everything from 29.6 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources