197 m
Hyperfocal distance
98.5 m
Sharp from (focused at hyperfocal)
161 mm f/4.3
Full-frame equivalent
15°
Diagonal angle of view
Depth of field by subject distance#
105 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 |
|---|---|---|---|---|---|
| 30.0 cm (0.98 ft) | 30.0 cm | 30.0 cm | 0.1 cm | 50% / 50% | 85.92% |
| 50.0 cm (1.64 ft) | 49.9 cm | 50.1 cm | 0.2 cm | 50% / 50% | 42.42% |
| 75.0 cm (2.46 ft) | 74.8 cm | 75.2 cm | 0.5 cm | 50% / 50% | 25.98% |
| 1.00 m (3.28 ft) | 99.5 cm | 1.00 m | 0.9 cm | 50% / 50% | 18.72% |
| 1.50 m (4.92 ft) | 1.49 m | 1.51 m | 2.1 cm | 50% / 50% | 12.01% |
| 2.00 m (6.56 ft) | 1.98 m | 2.02 m | 3.9 cm | 50% / 50% | 8.84% |
| 3.00 m (9.84 ft) | 2.96 m | 3.04 m | 8.8 cm | 49% / 51% | 5.79% |
| 4.00 m (13.1 ft) | 3.92 m | 4.08 m | 15.8 cm | 49% / 51% | 4.30% |
| 5.00 m (16.4 ft) | 4.88 m | 5.13 m | 24.9 cm | 49% / 51% | 3.42% |
| 7.00 m (23.0 ft) | 6.76 m | 7.25 m | 49.1 cm | 48% / 52% | 2.43% |
| 10.0 m (32.8 ft) | 9.52 m | 10.5 m | 1.01 m | 47% / 53% | 1.69% |
| 15.0 m (49.2 ft) | 13.9 m | 16.2 m | 2.28 m | 46% / 54% | 1.12% |
| 20.0 m (65.6 ft) | 18.2 m | 22.2 m | 4.08 m | 45% / 55% | 0.84% |
| 30.0 m (98.4 ft) | 26.0 m | 35.4 m | 9.33 m | 42% / 58% | 0.56% |
| 50.0 m (164 ft) | 39.9 m | 67.0 m | 27.1 m | 37% / 63% | 0.34% |
| 100 m (328 ft) | 66.3 m | 203 m | 137 m | 25% / 75% | 0.17% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
105 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 105 mm lens on APS-C is a natural choice for portraits and subject isolation. Focused at 3 m you get 8.8 cm of sharp zone; for maximum front-to-back sharpness focus at 197 m and everything from 98.5 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 105mm lens at f/2.8?
On APS-C, focused at 3 m, it is 8.8 cm; at 1 m it is 0.9 cm.
What is the hyperfocal distance for 105mm f/2.8?
197 m (646 ft) on APS-C. Everything from 98.5 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources