Berechnung der Schärfentiefe (depth of field)
Berechnung der Schärfentiefe (depth of field) Schärfentiefe verschiedene Brenneweiten/Blenden-Einstellungen| f-stop/f | 18 | 28 | 30 | 35 | 50 |
|---|---|---|---|---|---|
|
These values show the minimal focus distance to get unlimited depth of field for all listed f/f-stop combinations. All distances in meters (m). Circle of Confusion: 0.02mm |
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| 2.8 | 5.8 | 14.03 | 16.1 | 21.91 | 44.69 |
| 4 | 4.07 | 9.83 | 11.28 | 15.35 | 31.3 |
| 5.6 | 2.91 | 7.03 | 8.07 | 10.97 | 22.37 |
| 8 | 2.04 | 4.93 | 5.66 | 7.69 | 15.68 |
| 11 | 1.49 | 3.59 | 4.12 | 5.6 | 11.41 |
| 16 | 1.03 | 2.48 | 2.84 | 3.86 | 7.86 |
| f-stop/f | 55 | 75 | 100 | 150 | 200 |
|---|---|---|---|---|---|
|
These values show the minimal focus distance to get unlimited depth of field for all listed f/f-stop combinations. All distances in meters (m). Circle of Confusion: 0.02mm |
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| 4 | 37.87 | 70.39 | 125.1 | 281.4 | 500.2 |
| 5.6 | 27.06 | 50.3 | 89.39 | 201.04 | 357.34 |
| 8 | 18.96 | 35.23 | 62.6 | 140.78 | 250.2 |
| 11 | 13.81 | 25.64 | 45.55 | 102.42 | 182.02 |
| 16 | 9.51 | 17.65 | 31.35 | 70.46 | 125.2 |
| 22 | 6.93 | 12.86 | 22.83 | 51.29 | 91.11 |
Verwendete Formeln für die Berechnung:
dh = f*f / k*z
g = dh + f
Also zusammen: g = (f*f/k*z)+f
g = Gegenstandsweite (Zoomeinstellung, hier in mm)
dh = Hyperfokaldistanz
f = Brennweite in mm (z.B. 18 mm)
k = Blendenzahl (z.B. 2.8)
z = Zerstreuungskreis (bei der Nikon D70(s) 0.02mm, bei KB-Film meist 0.03)
Die Beispielwerte in der Formel:
g = ((18 mm*18 mm) / (2.8 * 0.02mm)) + 18mm
= (324 mm² / 0.056 mm) + 18 mm
= (324 mm / 0.056) + 18 mm
= 5804 mm
g = 5.8 m