Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 176

3 Custom Function Settings C.Fn IV -10 Button function when 5 0: Normal (enable) 1: Disable 6,5,Multi-controller When the power switch is set to , the , , and will be disabled from setting anything. The shutter button can still be used to shoot. This prevents any settings to be changed inadvertently, so it is convenient when you keep shooting with the same settings. Even with setting 1, if the power switch is set to , you can use , , and to change settings. C.Fn IV -11 Focusing Screen If you change the focusing screen, change this setting to match the focusing screen type. This is to obtain the correct exposures. 0: lEc-C IV Standard focusing screen (Laser-matte). 1: lEc-A, B, C, C II, C III, D, H, I, L For Laser-matte screens. 2: pEc-S For Super Precision Matte screens. 3: kEc-N,R For New Laser-matte screens. The pEc-S focusing screen is optimized for lenses whose maximum aperture is f/1.8 to f/2.8. If the lens maximum aperture is brighter than f/1.8, the center spot metering circle and Area AF ellipse might become difficult to see. Also, if the lens maximum aperture is slower than f/2.8, the viewfinder will look darker. Even if all the Custom Functions are cleared, this setting will be retained. Since the Ec-A, Ec-B, Ec-I, and Ec-L focusing screens have a prism at the center, correct exposures cannot be obtained with evaluative metering and center spot metering. Use either center-weighted average metering or AF point-linked spot metering (except the center AF point). To change the focusing screen, refer to the instructions that came with the focusing screen. 176