88.9 m
Hyperfocal distance
44.5 m
Sharp from (focused at hyperfocal)
80 mm f/2.4
Full-frame equivalent
30°
Diagonal angle of view
Depth of field by subject distance#
40 mm at f/1.2 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 | 0.2 cm | 50% / 50% | 29.64% |
| 50.0 cm (1.64 ft) | 49.7 cm | 50.3 cm | 0.5 cm | 50% / 50% | 16.75% |
| 75.0 cm (2.46 ft) | 74.4 cm | 75.6 cm | 1.2 cm | 50% / 50% | 10.86% |
| 1.00 m (3.28 ft) | 98.9 cm | 1.01 m | 2.2 cm | 49% / 51% | 8.03% |
| 1.50 m (4.92 ft) | 1.48 m | 1.53 m | 4.9 cm | 49% / 51% | 5.28% |
| 2.00 m (6.56 ft) | 1.96 m | 2.05 m | 8.8 cm | 49% / 51% | 3.93% |
| 3.00 m (9.84 ft) | 2.90 m | 3.10 m | 20.0 cm | 48% / 52% | 2.60% |
| 4.00 m (13.1 ft) | 3.83 m | 4.19 m | 35.7 cm | 48% / 52% | 1.95% |
| 5.00 m (16.4 ft) | 4.74 m | 5.30 m | 56.0 cm | 47% / 53% | 1.55% |
| 7.00 m (23.0 ft) | 6.49 m | 7.59 m | 1.10 m | 46% / 54% | 1.11% |
| 10.0 m (32.8 ft) | 8.99 m | 11.3 m | 2.27 m | 44% / 56% | 0.77% |
| 15.0 m (49.2 ft) | 12.8 m | 18.0 m | 5.20 m | 42% / 58% | 0.52% |
| 20.0 m (65.6 ft) | 16.3 m | 25.8 m | 9.46 m | 39% / 61% | 0.39% |
| 30.0 m (98.4 ft) | 22.4 m | 45.3 m | 22.8 m | 33% / 67% | 0.26% |
| 50.0 m (164 ft) | 32.0 m | 114 m | 82.2 m | 22% / 78% | 0.15% |
| 100 m (328 ft) | 47.1 m | ∞ | ∞ | — | 0.08% |
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/1.2#
Same lens settings on other formats#
When to use it#
At f/1.2, 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 20.0 cm of sharp zone; for maximum front-to-back sharpness focus at 88.9 m and everything from 44.5 m to infinity will be acceptably sharp.
See also the f/1.2 aperture guide.
Frequently asked questions#
What is the depth of field of a 40mm lens at f/1.2?
On Micro Four Thirds, focused at 3 m, it is 20.0 cm; at 1 m it is 2.2 cm.
What is the hyperfocal distance for 40mm f/1.2?
88.9 m (292 ft) on Micro Four Thirds. Everything from 44.5 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources