1.5 km
Hyperfocal distance
750 m
Sharp from (focused at hyperfocal)
600 mm f/8.0
Full-frame equivalent
4°
Diagonal angle of view
Depth of field by subject distance#
300 mm at f/4 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 |
|---|---|---|---|---|---|
| 75.0 cm (2.46 ft) | 75.0 cm | 75.0 cm | 0.0 cm | 50% / 50% | 289.02% |
| 1.00 m (3.28 ft) | 100.0 cm | 1.00 m | 0.1 cm | 50% / 50% | 185.80% |
| 1.50 m (4.92 ft) | 1.50 m | 1.50 m | 0.2 cm | 50% / 50% | 108.38% |
| 2.00 m (6.56 ft) | 2.00 m | 2.00 m | 0.5 cm | 50% / 50% | 76.50% |
| 3.00 m (9.84 ft) | 2.99 m | 3.01 m | 1.1 cm | 50% / 50% | 48.17% |
| 4.00 m (13.1 ft) | 3.99 m | 4.01 m | 2.0 cm | 50% / 50% | 35.15% |
| 5.00 m (16.4 ft) | 4.98 m | 5.02 m | 3.1 cm | 50% / 50% | 27.67% |
| 7.00 m (23.0 ft) | 6.97 m | 7.03 m | 6.3 cm | 50% / 50% | 19.41% |
| 10.0 m (32.8 ft) | 9.94 m | 10.1 m | 12.9 cm | 50% / 50% | 13.41% |
| 15.0 m (49.2 ft) | 14.9 m | 15.1 m | 29.4 cm | 50% / 50% | 8.85% |
| 20.0 m (65.6 ft) | 19.7 m | 20.3 m | 52.5 cm | 49% / 51% | 6.60% |
| 30.0 m (98.4 ft) | 29.4 m | 30.6 m | 1.19 m | 49% / 51% | 4.38% |
| 50.0 m (164 ft) | 48.4 m | 51.7 m | 3.32 m | 48% / 52% | 2.62% |
| 100 m (328 ft) | 93.8 m | 107 m | 13.4 m | 47% / 53% | 1.30% |
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 | 33.3 m |
| 16 mm | 3.00 m | 8.21 m |
| 20 mm | 3.00 m | 3.35 m |
| 24 mm | 3.00 m | 2.06 m |
| 28 mm | 3.00 m | 1.44 m |
| 35 mm | 3.00 m | 89.0 cm |
| 40 mm | 3.00 m | 67.4 cm |
| 50 mm | 3.00 m | 42.7 cm |
| 85 mm | 3.00 m | 14.5 cm |
| 105 mm | 3.00 m | 9.5 cm |
| 135 mm | 3.00 m | 5.7 cm |
| 200 mm | 10.0 m | 29.4 cm |
| 300 mm | 10.0 m | 12.9 cm |
| 400 mm | 10.0 m | 7.2 cm |
| 600 mm | 10.0 m | 3.1 cm |
Same lens settings on other formats#
When to use it#
At f/4, a 300 mm lens on Micro Four Thirds is a natural choice for general photography. Focused at 3 m you get 1.1 cm of sharp zone; for maximum front-to-back sharpness focus at 1.5 km and everything from 750 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 Micro Four Thirds, focused at 3 m, it is 1.1 cm; at 1 m it is 0.1 cm.
What is the hyperfocal distance for 300mm f/4?
1.5 km (4922 ft) on Micro Four Thirds. Everything from 750 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources