Grid and Focus Point Overlays
Grid Display
Press Ctrl+G or select Display Grid from the View menu to toggle the grid overlay on the preview image. Select Grid Settings… from the View menu to configure the grid.
Select Show print area to display the extent of a particular print size. For example, most digital SLRs shoot at a 3:2 aspect ratio, which fits a 6”×4” print but must be cropped for 10”×8” paper. Set the print aspect ratio to 10 × 8 to display the extent of a 10”×8” print area.
Focus Point Overlay Display
Press Ctrl+F or click the Display overlay checkbox to toggle the focus point overlay. When enabled, the seven focus point areas and the viewfinder circle are displayed over the preview image. Active focus points are shown in red.
Focus points can be selected from the PC for all camera models except the EOS-1D and EOS-1DS (a Canon SDK limitation).