The Canon EOS 40D Digital SLR retains the same 35-zone metering sensor as its
predecessor. Available patterns include Evaluative metering, which is linked to
all AF points and is set automatically in the Basic Zone modes, Centerweighted
average metering, Partial metering, and Spot metering, covering approximately 9
percent or 3.8 percent of the viewfinder at center, respectively. The camera's
E-TTL II autoflash and 12 exposure control modes (11 AE modes plus manual) are
also unchanged from the EOS 30D SLR model. However, as a result of consumer
input, Canon has added three Custom exposure modes. As an added convenience,
particularly for wireless flash operations, users can adjust the flash settings
of the Canon Speedlite 580EX II directly from the camera.
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