Canon EOS Digital Rebel XT White Paper

Also see for EOS REBEL XT: Instruction manual Instruction manual Firmware update procedures

Contents

Canon EOS Digital Rebel XT White Paper Manual pdf 19 page image

III. DISCUSSION 19Exposure ControlsThe EOS Digital Rebel XT camera offers a broad and flexible range of exposure controls.In the Basic Zone modes, evaluative metering, linked to all 7 AF points, is automaticallyselected. In the Creative Zone modes, partial metering at the center (9% of theviewfinder) and centerweighted average metering are also available. Pressing the leftcross key displays the Metering Mode menu.Eight exposure modes offer a total of 14 different options:Program AE (shiftable), Shutter-priority AE, Aperture-priority AE, Auto Depth-of-Field AE (A-DEP, non-shiftable),Full Auto (Program AE, non-shiftable), six ProgrammedImage Control modes (Portrait, Landscape, Close-Up,Sports, Night Portrait, Flash OFF), Manual exposure(including Bulb), and E-TTL II autoflash program (C. Fn.8-0: Evaluative metering, C. Fn. 8-1: Averaged metering).The range of available ISOs is from 100 to 1600. In the Basic Zone modes, the ISOcannot be set manually, whereas in the Creative Zone modes, the ISO cannot be setautomatically. Pressing the top cross key displays the ISO speed menu.Manual exposure compensation is enabled in each of the Creative Zones except Manual.Bracketing can extend to +/- 2 stops in 1/2 or 1/3 stop increments. Depending on theshooting mode, either shutter speed, aperture, or both can be varied. Auto exposurebracketing, AEB, is available in the Creative Zone modes and is set with the on-screenmenu. The bracketing sequence is, first, the standard exposure, then decreasedexposure and, last, increased exposure. The range is the same as with manualbracketing. Conveniently, auto exposure bracketing can be used in combination withwhite balance bracketing, in which case nine images are generated.Both auto and manual AE lock are available in Creative Zone AE modes. In the One-ShotAF mode with evaluative metering, AE lock takes effect when focus is achieved. Duringevaluative metering, AE lock centers on the selected AF point. During partial metering atthe center, or with centerweighted averaged metering, AE lock fixes on the center AFpoint. Normally, manual AE lock is enabled with the AE lock button. Pressing the buttonagain renews the AE lock in the event of subject or camera movement. When the built-inflash or an EX-series Speedlite is used, the AE lock button works as an FE lock button.Viewfinder