The sunny 16 rule is a method of estimating correct exposures during the daytime without a light meter by setting the shutter speed to the same value of the ISO then setting the aperture according to the table below. For example; In a sunny day with 100 ISO set shutter speed to 1/100s and aperture to f/16. If the ISO is 400, then shutter speed should be 1/400s and so on.
| Aperture (F-Stop) | Lighting Condition | Shadow Details |
| f/22 | Snow or sand | Dark with sharp edges |
| f/16 | Sunny | Distinct |
| f/11 | Slightly overcast | Soft around edges |
| f/8 | Overcast | Barely visible |
| f/5.6 | Heavy overcast | No shadow |
| f/4 | Shade or sunset | No shadow |
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