Samsung SDP-9000DXR User Manual page 29

Adjusting your image with GUI
Focus
Allow to focus an object in the far / near distance, or automatically.
Holding down [Far]/[Near] menu with the left mouse button, focus is activated.
Click [Auto] menu to auto focus function.
Zoom
Allow to enlarge or reduce the image size.
Holding down [Tele]/[Wide] menu with the left mouse button, zoom is activated.
Bright
Allow to open IRIS to increase the brightness or close IRIS to decrease the brightness.
Holding down [Up]/[Down] menu with the left mouse button, lens iris is activated.