Canon EOS 70D Operation Manual - Page 159

d: Program AE If the "30"" shutter speed and the lower f/number blink, it indicates underexposure. Increase the ISO speed or use flash. If the "8000" shutter speed and the higher f/number blink, it indicates overexposure. Lower the ISO speed or use an ND filter (sold separately) to reduce the amount of light entering the lens. Differences Between and Modes In the mode, many functions, such as the AF operation and metering mode, are set automatically to prevent spoiled shots. The functions you can set are limited. With mode, only the shutter speed and aperture are set automatically. You can freely set the AF operation, metering mode, and other functions (p.404). Program Shift In the Program AE mode, you can freely change the shutter speed and aperture combination (Program) set automatically by the camera while maintaining the same exposure. This is called Program shift. To shift the program, press the shutter button halfway, then turn the dial until the desired shutter speed or aperture is displayed. Program shift will be canceled automatically when the metering timer (0) ends (exposure setting display turns off). Program shift cannot be used with flash. 159