Nikon D3s Body Only D3S User's Manual - Page 344

A Virtual Horizon When Virtual horizon is selected for Fn button press, the exposure indicators in the viewfinder and top control panel can be used as a horizontal level. Press the Fn button to toggle between exposure and tilt meter displays. Camera tilted right Camera level Camera tilted left Control panel Viewfinder Note that the display may not be accurate when the camera is tilted at a sharp angle forward or back. ❚❚ Fn button + command dials Selecting Fn button + command dials for Custom Setting f4 displays the following options: Option i Choose image area Description Press the Fn button and rotate the main command dial to highlight the desired image area (0 78); press 2 to select or deselect. Highlight Done and press J when settings are complete. U 318