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At an ISO of 100, which many digital cameras use for general-purpose photography, you might want to rely on the traditional Sunny 16 Rule for a starting point. The Sunny 16 Rule is very old—it dates back to the earliest days of analog photography—and it suggests that when shooting outdoors in bright sunlight, choose an aperture of f/16 and a shutter speed that’s equivalent to your film speed. Since few cameras offer the capability to choose 1/100, most photographers that rely on this rule use 1/60 or 1/125 when shooting with ISO 100 film. The following table identifies other acceptable combinations. (All these add up to the same overall exposure.)

Shutter    SpeedAperture
1/1000     F/4
1/500       F/5.6
1/250       F/8
1/125       F/11
1/60         F/16
1/30         F/22

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