Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 93

d: Program AE 5 Take the picture. Compose the shot and press the shutter button completely. If "30"" shutter speed and the maximum aperture blink, it indicates underexposure. Increase the ISO speed or use flash. If the "8000" shutter speed and the minimum aperture blink, it indicates overexposure. Lower the ISO speed or use an ND filter (sold separately) to reduce the amount of light entering the lens. If the focus confirmation light blinks, the shutter will lock and a picture cannot be taken. (p.86) When automatic AF point selection is used (p.84), multiple AF points may flash simultaneously when focus is achieved. About Program Shift In Program AE mode, you can freely change the shutter speed and aperture combination (Program) set by the camera while maintaining the same exposure. This is called Program Shift. To do this, press the shutter button down halfway, then turn the dial until the desired shutter speed or aperture value is displayed. Program Shift is canceled automatically after the picture is taken. Program Shift cannot be used with flash. 93