1.6 km
Hyperfocal distance
804 m
Sharp from (focused at hyperfocal)
460 mm f/4.3
Full-frame equivalent
5°
Diagonal angle of view
Depth of field by subject distance#
300 mm at f/2.8 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 | 0.0 cm | 50% / 50% | 303.95% |
| 1.00 m (3.28 ft) | 100.0 cm | 1.00 m | 0.1 cm | 50% / 50% | 195.40% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.2 cm | 50% / 50% | 113.98% |
| 2.00 m (6.56 ft) | 2.00 m | 2.00 m | 0.4 cm | 50% / 50% | 80.46% |
| 3.00 m (9.84 ft) | 2.99 m | 3.01 m | 1.0 cm | 50% / 50% | 50.66% |
| 4.00 m (13.1 ft) | 3.99 m | 4.01 m | 1.8 cm | 50% / 50% | 36.97% |
| 5.00 m (16.4 ft) | 4.99 m | 5.01 m | 2.9 cm | 50% / 50% | 29.10% |
| 7.00 m (23.0 ft) | 6.97 m | 7.03 m | 5.8 cm | 50% / 50% | 20.41% |
| 10.0 m (32.8 ft) | 9.94 m | 10.1 m | 12.1 cm | 50% / 50% | 14.10% |
| 15.0 m (49.2 ft) | 14.9 m | 15.1 m | 27.4 cm | 50% / 50% | 9.30% |
| 20.0 m (65.6 ft) | 19.8 m | 20.2 m | 49.0 cm | 49% / 51% | 6.94% |
| 30.0 m (98.4 ft) | 29.5 m | 30.6 m | 1.11 m | 49% / 51% | 4.61% |
| 50.0 m (164 ft) | 48.5 m | 51.6 m | 3.10 m | 48% / 52% | 2.75% |
| 100 m (328 ft) | 94.2 m | 107 m | 12.5 m | 47% / 53% | 1.37% |
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/2.8#
Same lens settings on other formats#
When to use it#
At f/2.8, a 300 mm lens on APS-C is a natural choice for portraits and subject isolation. Focused at 3 m you get 1.0 cm of sharp zone; for maximum front-to-back sharpness focus at 1.6 km and everything from 804 m to infinity will be acceptably sharp.
See also the f/2.8 aperture guide.
Frequently asked questions#
What is the depth of field of a 300mm lens at f/2.8?
On APS-C, focused at 3 m, it is 1.0 cm; at 1 m it is 0.1 cm.
What is the hyperfocal distance for 300mm f/2.8?
1.6 km (5274 ft) on APS-C. Everything from 804 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources