TECH SUPPORT Exposure Control Q. I use exposure compensation on my Nikon D80, but I’m not clear on the mechanics of how it works. Is it just another way of modifying aperture or shutter speed, or does it use a whole different approach? A. Exposure compensation simply nudges the autoexposure setting up or down, using either the shutter or the aperture or both. It works differently in various exposure modes. With the camera in aperture-priority mode, the camera will maintain the aperture you set and compensate the exposure by changing only the shutter speed. In shutter-priority mode, the camera will maintain your shutter speed, and vary only the aperture—within the limits of the largest and smallest apertures, at which points most cameras will start nudging the shutter speed up or down. In program auto mode, the camera will increase or decrease the exposure using aperture and shutter in tandem, varying both in equal measure according to the camera’s program line. Many cameras allow exposure compensation in manual; when you meter manually, the indicated exposure will reflect this deviation. |
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