14.3 m
Hyperfocal distance
7.15 m
Sharp from (focused at hyperfocal)
31 mm f/2.1
Full-frame equivalent
70°
Diagonal angle of view
Depth of field by subject distance#
20 mm at f/1.4 on APS-C (23.5×15.6 mm), circle of confusion 20 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 | 1.2 cm | 49% / 51% | 4.34% |
| 50.0 cm (1.64 ft) | 48.4 cm | 51.7 cm | 3.4 cm | 48% / 52% | 2.53% |
| 75.0 cm (2.46 ft) | 71.4 cm | 79.0 cm | 7.7 cm | 47% / 53% | 1.67% |
| 1.00 m (3.28 ft) | 93.6 cm | 1.07 m | 13.8 cm | 47% / 53% | 1.24% |
| 1.50 m (4.92 ft) | 1.36 m | 1.67 m | 31.4 cm | 45% / 55% | 0.82% |
| 2.00 m (6.56 ft) | 1.76 m | 2.32 m | 56.5 cm | 43% / 57% | 0.61% |
| 3.00 m (9.84 ft) | 2.48 m | 3.79 m | 1.31 m | 40% / 60% | 0.41% |
| 4.00 m (13.1 ft) | 3.13 m | 5.54 m | 2.42 m | 36% / 64% | 0.31% |
| 5.00 m (16.4 ft) | 3.71 m | 7.68 m | 3.97 m | 33% / 67% | 0.24% |
| 7.00 m (23.0 ft) | 4.70 m | 13.7 m | 8.99 m | 26% / 74% | 0.17% |
| 10.0 m (32.8 ft) | 5.89 m | 33.2 m | 27.3 m | 15% / 85% | 0.12% |
| 15.0 m (49.2 ft) | 7.32 m | ∞ | ∞ | — | 0.08% |
| 20.0 m (65.6 ft) | 8.34 m | ∞ | ∞ | — | 0.06% |
| 30.0 m (98.4 ft) | 9.68 m | ∞ | ∞ | — | 0.04% |
| 50.0 m (164 ft) | 11.1 m | ∞ | ∞ | — | 0.02% |
| 100 m (328 ft) | 12.5 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/1.4#
Same lens settings on other formats#
When to use it#
At f/1.4, a 20 mm lens on APS-C is a natural choice for environmental portraits, street and low light. Focused at 3 m you get 1.31 m of sharp zone; for maximum front-to-back sharpness focus at 14.3 m and everything from 7.15 m to infinity will be acceptably sharp.
See also the f/1.4 aperture guide.
Frequently asked questions#
What is the depth of field of a 20mm lens at f/1.4?
On APS-C, focused at 3 m, it is 1.31 m; at 1 m it is 13.8 cm.
What is the hyperfocal distance for 20mm f/1.4?
14.3 m (46.9 ft) on APS-C. Everything from 7.15 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources