Samsung SDP-950STA Software User's Manual page 48

1. Image Control Slider
Zoom: Activates zoom control.
Focus: Activates focus control.
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By using the Samsung Digital Visual Presenter
program, the user can change an input image by
controlling the visual presenter.
With the control slider, the user can control zooming,
focusing screen brightness & color.
Press a function selection button below the slider to activate
the slider and fine control buttons, and control the selected
function. The initial state is zoom control.