Canon EOS-1D C EOS 1D X Instruction Manual - Page 331
C.Fn4: Display/Operation
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3 Custom Function Settings C.Fn4: Display/Operation Focusing Screen You can change the focusing screen to an Ec-series focusing screen more suited for your shooting. If you change the focusing screen, change this setting to match the focusing screen type to obtain the correct exposure. Std.: Ec-CV Standard focusing screen. : Ec-A, B, D, H, I, L For Laser-matte screens. Since the Ec-A/B/I/L focusing screens have a prism at the center, the correct exposure cannot be obtained with evaluative metering or center spot metering. Use either center-weighted average metering or AF pointlinked spot metering (except the center AF point). Since the Ec-A/B/I/L focusing screens have a prism in the center, AF based on the color and facial information of a subject at the center of the viewfinder may not be achieved, even if [Auto AF pt sel.: EOS iTR AF] is set to [Enable] (p.96). Although an Ec-C/CII/CIII/CIV/N/R/S focusing screen can be installed in the camera, the correct exposure will not be obtained. Use a commercially-available light meter to set a manual exposure or set exposure compensation and shoot. The Area AF frame displayed on the Ec-CIII/CIV/N/S focusing screens is different from this camera's AF Area. To change the focusing screen, refer to the instructions that come with the focusing screen. 331
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