How to switch the viewfinder and LCD of Canon a 1 100is?
Press the DISP key to close the display and use only the optical viewfinder. Press the DISP key continuously, and the display will switch between non-display and detailed display. So, you press the DISP key once. If the display is not closed, press it again. If not, you can close the display. To open it, just press the DISP key continuously.