1.1 km
Hyperfocal distance
563 m
Sharp from (focused at hyperfocal)
460 mm f/6.1
Full-frame equivalent
5°
Diagonal angle of view
Depth of field by subject distance#
300 mm at f/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 |
|---|---|---|---|---|---|
| 75.0 cm (2.46 ft) | 75.0 cm | 75.0 cm | 0.1 cm | 50% / 50% | 212.77% |
| 1.00 m (3.28 ft) | 99.9 cm | 1.00 m | 0.1 cm | 50% / 50% | 136.78% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.3 cm | 50% / 50% | 79.79% |
| 2.00 m (6.56 ft) | 2.00 m | 2.00 m | 0.6 cm | 50% / 50% | 56.32% |
| 3.00 m (9.84 ft) | 2.99 m | 3.01 m | 1.4 cm | 50% / 50% | 35.46% |
| 4.00 m (13.1 ft) | 3.99 m | 4.01 m | 2.6 cm | 50% / 50% | 25.88% |
| 5.00 m (16.4 ft) | 4.98 m | 5.02 m | 4.2 cm | 50% / 50% | 20.37% |
| 7.00 m (23.0 ft) | 6.96 m | 7.04 m | 8.3 cm | 50% / 50% | 14.29% |
| 10.0 m (32.8 ft) | 9.91 m | 10.1 m | 17.2 cm | 50% / 50% | 9.87% |
| 15.0 m (49.2 ft) | 14.8 m | 15.2 m | 39.2 cm | 49% / 51% | 6.51% |
| 20.0 m (65.6 ft) | 19.7 m | 20.4 m | 70.1 cm | 49% / 51% | 4.86% |
| 30.0 m (98.4 ft) | 29.2 m | 30.8 m | 1.59 m | 49% / 51% | 3.22% |
| 50.0 m (164 ft) | 47.9 m | 52.3 m | 4.43 m | 48% / 52% | 1.93% |
| 100 m (328 ft) | 91.9 m | 110 m | 17.9 m | 46% / 54% | 0.96% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
300 mm at other apertures (subject at 3 m)#
Other focal lengths at f/4#
| Focal length | Subject at | Total DoF |
|---|---|---|
| 14 mm | 3.00 m | ∞ |
| 16 mm | 3.00 m | 42.9 m |
| 20 mm | 3.00 m | 5.55 m |
| 24 mm | 3.00 m | 2.99 m |
| 28 mm | 3.00 m | 2.00 m |
| 35 mm | 3.00 m | 1.21 m |
| 40 mm | 3.00 m | 90.8 cm |
| 50 mm | 3.00 m | 57.1 cm |
| 85 mm | 3.00 m | 19.4 cm |
| 105 mm | 3.00 m | 12.6 cm |
| 135 mm | 3.00 m | 7.5 cm |
| 200 mm | 10.0 m | 39.2 cm |
| 300 mm | 10.0 m | 17.2 cm |
| 400 mm | 10.0 m | 9.6 cm |
| 600 mm | 10.0 m | 4.2 cm |
Same lens settings on other formats#
When to use it#
At f/4, a 300 mm lens on APS-C is a natural choice for general photography. Focused at 3 m you get 1.4 cm of sharp zone; for maximum front-to-back sharpness focus at 1.1 km and everything from 563 m to infinity will be acceptably sharp.
See also the f/4 aperture guide.
Frequently asked questions#
What is the depth of field of a 300mm lens at f/4?
On APS-C, focused at 3 m, it is 1.4 cm; at 1 m it is 0.1 cm.
What is the hyperfocal distance for 300mm f/4?
1.1 km (3692 ft) on APS-C. Everything from 563 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources