A rule of thumb giving base speed/aperture values to use in manual mode.
Set the shutter speed to 1/(ISO setting).
Set the lens aperture to f/16 in sunny conditions with distinct shadows or …
| Aperture | Lighting | Shadow |
|---|---|---|
| f/16 | Sunny | Distinct |
| f/11 | Slight Overcast | Soft around edges |
| f/8 | Overcast | Barely visible |
| f/5.6 | Heavy Overcast | No shadows |
| f/4 | Sunset |