Selecting the f-number
| Lens opening |
Guidelines | Example - 50mm f/2 Lens Normal Focal Length |
|---|---|---|
| Maximum for lens |
Good for obtaining enough exposure in poor lighting conditions, such as existing light. Minimum depth of field - very shallow. Poorest lens quality for specific lens. |
f/2 |
| One stop smaller than maximum lens opening |
Good for obtaining enough exposure in poor lighting. Shallow depth of field. Helpful to throw background out of focus to concentrate attention on subject. Good lens quality. |
f/2.8 |
| Two and three stops smaller than maximum lens opening |
Best lens quality for specific lens. Better depth of field than with larger lens openings. Good for limited distance range of sharp focus. Good for obtaining proper exposure when lighting conditions are less than optimum, such as on cloudy days or in the shade. |
f/4 and f/5.6 |
| Two stop larger than minimum lens opening |
Moderate depth of field. Good all around lens opening to use for outdoor daylight pictures. Excellent lens quality. |
f/8 |
| One stop larger than minimum lens opening |
Great depth of fied. Good all around lens opening to use for outdoor daylight conditions. Excellent lens quality. |
f/11 |
| Minimum for lens |
Maximum depth of field. Very slight loss of sharpness due to optical effects. When maximum depth of field is important, the benefits from increased depth of field with this lens opening outweigh the disadvantages from an almost imperceptible loss in sharpness. |
f/16 |
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