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What are those options in the camera’s menu that have BKT in their labels?
BKT is the abbreviation for BRACKET. Bracketing is a photographic technique in which the same scene or subject is shot at different exposure settings. Its value is that several images can be taken of a subject at different exposures to ensure that an acceptable exposure will be captured. Olympus DSLR and PEN cameras have four bracketing modes.
- AE BKT (Autoexposure Bracketing) – The camera will adjust the exposure value selected for each consecutive image in a sequence. The photographer can select the preferred exposure from different images captured. The exposure compensation settings to be applied are entered in the menu. The camera captures an image with the optimum metered exposure, then the underexposed value and finally the overexposed value, for example: Image 1 - 0.0, Image 2 - -1.0, Image 3 - +1.0. (The E-3 and E-30 can shoot three or five images).
- WB BKT (White Balance Bracketing) – Three images with different white balances are automatically created from one captured image. The camera does this by processing the captured image three different ways and writing the three final images to the memory card. White Balance Bracketing can be valuable in situations with mixed light sources such as a room lit by both window light and tungsten bulbs. The first image uses the AUTO or preset white balance, the second image applies the Y-B or A-B (Yellow-Blue or Amber-Blue, depending on the camera model) value and the last image applies the G-M (Green-Magenta) value. The Y-B or A-B value would be more appropriate for tungsten lighting and the G-M value would be best for fluorescent lighting.
- FL BKT (Flash Bracketing) – The camera captures three images, changing the amount of light emitted by the flash for each shot. This can be useful when shooting with fill-in flash where it may be difficult to determine how much fill light to apply. The first image will be the optimum exposure judged by the TTL metering system, the second image will underexpose the flash and the third image will overexpose the flash exposure. The amount of exposure compensation applied to the flash is set in the camera’s menu.
- ISO BKT (ISO Bracketing) – In AE BKT the camera performs the bracket by changing the shutter speed and f-stop combinations for the series of exposures. There may be situations in which it is desirable to maintain the same shutter speed and f-stop through the series of bracketed images. The first image uses the exposure determined by the camera at the preset ISO, the second image uses a lower ISO and the final image uses a higher ISO. The degree of underexposure and overexposure are set in the camera’s menu.
When shooting bracketed exposures, if the camera is set for single-image shooting, a shutter button press is required for each exposure. If the camera is set to Sequential Shooting Mode, the shutter button should be held down until the bracket is completed. Be sure to set any bracketing function to OFF when it is not needed, or you will get underexposed and overexposed shots.
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