Depth of field for the Pentax smc Pentax-DA 18-250mm f/3.5-6.3 ED AL [IF] on the Pentax K-3 III (1.55× crop, circle of confusion 0.019 mm). At 18 mm and f/8 the hyperfocal distance is 2.1 m — focus there and everything from 1.1 m to infinity is sharp.
Focal length
18 mm
28 mm FF equiv.
Hyperfocal @ f/8
2.1 m
7 ft
NPF wide open
13.1 s
f/3.5, 3.75 µm pixels
Horizontal FOV
65.8°
Depth of field chart at 18 mm
| Focus distance | f/4 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|
| 1 m | 0.81–1.3 m | 0.75–1.5 m | 0.68–1.9 m | 0.61–2.8 m | 0.52–17.0 m |
| 2 m | 1.36–3.8 m | 1.20–6.0 m | 1.03–39.7 m | 0.87–∞ m | 0.69–∞ m |
| 3 m | 1.75–10.5 m | 1.50–∞ m | 1.24–∞ m | 1.01–∞ m | 0.78–∞ m |
| 5 m | 2.28–∞ m | 1.87–∞ m | 1.48–∞ m | 1.17–∞ m | 0.87–∞ m |
| 10 m | 2.95–∞ m | 2.30–∞ m | 1.73–∞ m | 1.32–∞ m | 0.95–∞ m |
| 20 m | 3.46–∞ m | 2.60–∞ m | 1.89–∞ m | 1.41–∞ m | 0.99–∞ m |
Each cell shows the near and far limits of acceptable sharpness.
Open the DoF calculator with this setup