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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Custom Function I (C.Fn. I): Exposure

This is the Custom Function category you can use to set the increments for exposure and ISO, define bracketing parameters, and other settings.

C.Fn I-01: Size of Exposure Adjustments

Exposure level increments

This setting tells the EOS 40D the size of the “jumps” it should use when making exposure adjustments—either one-third or one-half stop. The increment you specify here applies to f/stops, shutter speeds, EV changes, and autoexposure bracketing.

  • 0: 1/3 stop. Choose this setting when you want the finest increments between shutter speeds and/or f/stops. For example, the 40D will use shutter speeds such as 1/60th, 1/80th, 1/100th, and 1/125th second, and f/stops such as f/5.6, f/6.3, f/7.1, and f/8, giving ...

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