Tech Support Question: Back in the old days of cameras without autoexposure, most every photographer knew the "sunny 16" rule: The proper exposure in bright sunlight was the reciprocal of the ISO film speed at f/16. So, if you have your digital camera set to ISO 100, the proper exposure under a cloudless sun should be 1/100 sec at f/16. But my digital camera, a Nikon D40x, never even comes close to that. My photos are correctly exposed, but not what sunny f/16 would call for. Can you explain this? From: Hugh Cornell Guilford, England
Answer: There is often a discrepency between metered exposure and "correct" exposure. A classic example is a white sandy beach on a hazy bright day: While the camera meter might indicate an ISO 100 exposure of around 1/500 sec at f/16, the exposure taht would maintain the bright tonality of the scene would be more like 1/100 at f/16. and cameras now have "smart" meters (like Nikon) that evaluate the exposure on the basis of multiple tones in the image and even colors in the scene. Try this: Set your D40x to spotmeter and in sunlight, meter an evenly colored midtone, preferably a photo grey card. We're betting you'll get close to a sunny f/16 reading. Got a question? E-mail us at PopPhoto@bonniercorp.com. Also, visit the Tech Support forum at forums.popphoto.com. |
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