The "Sunny 22" Rule
Kissing cousin to the sunny 16 rule is the sunny 22 rule -- for white / very light colored objects under very bright conditions and where the subject fills most of the frame. In these situations the sunny 16 rule would result in detail being lost in the highlights. Reducing the level of light by half will darken those highlight areas and bring back detail. Just as with the sunny 16 rule, after you have determined the correct shutter speed, you can use any equivalent combination of shutter / aperature settings.
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