53.4 m
Hyperfocal distance
26.7 m
Sharp from (focused at hyperfocal)
80 mm f/4.0
Full-frame equivalent
30°
Diagonal angle of view
Depth of field by subject distance#
40 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) | 29.9 cm | 30.1 cm | 0.3 cm | 50% / 50% | 17.79% |
| 50.0 cm (1.64 ft) | 49.6 cm | 50.4 cm | 0.9 cm | 50% / 50% | 10.05% |
| 75.0 cm (2.46 ft) | 74.0 cm | 76.0 cm | 2.0 cm | 49% / 51% | 6.51% |
| 1.00 m (3.28 ft) | 98.2 cm | 1.02 m | 3.6 cm | 49% / 51% | 4.82% |
| 1.50 m (4.92 ft) | 1.46 m | 1.54 m | 8.2 cm | 49% / 51% | 3.17% |
| 2.00 m (6.56 ft) | 1.93 m | 2.08 m | 14.7 cm | 48% / 52% | 2.36% |
| 3.00 m (9.84 ft) | 2.84 m | 3.18 m | 33.4 cm | 47% / 53% | 1.56% |
| 4.00 m (13.1 ft) | 3.72 m | 4.32 m | 59.7 cm | 46% / 54% | 1.17% |
| 5.00 m (16.4 ft) | 4.57 m | 5.51 m | 93.8 cm | 45% / 55% | 0.93% |
| 7.00 m (23.0 ft) | 6.19 m | 8.05 m | 1.86 m | 43% / 57% | 0.66% |
| 10.0 m (32.8 ft) | 8.43 m | 12.3 m | 3.87 m | 41% / 59% | 0.46% |
| 15.0 m (49.2 ft) | 11.7 m | 20.8 m | 9.13 m | 36% / 64% | 0.31% |
| 20.0 m (65.6 ft) | 14.6 m | 32.0 m | 17.4 m | 31% / 69% | 0.23% |
| 30.0 m (98.4 ft) | 19.2 m | 68.5 m | 49.2 m | 22% / 78% | 0.15% |
| 50.0 m (164 ft) | 25.8 m | 791 m | 765 m | 3% / 97% | 0.09% |
| 100 m (328 ft) | 34.8 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/2#
Same lens settings on other formats#
When to use it#
At f/2, 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 33.4 cm of sharp zone; for maximum front-to-back sharpness focus at 53.4 m and everything from 26.7 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 40mm lens at f/2?
On Micro Four Thirds, focused at 3 m, it is 33.4 cm; at 1 m it is 3.6 cm.
What is the hyperfocal distance for 40mm f/2?
53.4 m (175 ft) on Micro Four Thirds. Everything from 26.7 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources