# Sunny 16 https://expertphotography.com/photography-101-sunny-16-rule/ The Sunny 16 rule states that, on sunny days, your shutter speed is the inverse of your ISO value at an aperture of f/16. For instance, if you set your camera at an aperture of f/16 and ISO 100, your shutter speed should be 1/100 s (seconds). It’s one of the easiest photography rules to remember. --- The Sunny 16 chart below illustrates the conditions for which the different rules apply: Sunny 16 Rule: This is when you photograph in an open field on a sunny day. Slight Overcast 11 Rule: This is when the sky is variable. Overcast 8 Rule: This is for cloudy weather, but not when it’s dark. Heavy Overcast 5.6 Rule: This is for bad weather, maybe when it’s rainy. Sunset 4 Rule: This is for typical sunset conditions. Snowy 22 Rule: If the sun is shining over a snowy landscape, f/22 is the suggested aperture. It gives you a balanced exposure using a shutter speed inverse of your ISO.