Choose the image area and enable or disable the viewfinder mask display.
Choose Image Area
The camera offers a choice of the following image areas:
Auto DX Crop
If On is selected, photos taken using a DX lens will automatically be recorded in DX format using the DX (24×16) image area.
Viewfinder Mask Display
If On is selected, the area outside the 1.2× (30×20), DX (24×16), 5 : 4 (30×24), and 1 : 1 (24×24) crops will be shown in gray in the viewfinder.