BENQ MS-550 BUSINESS PROJECTOR 3600 LUMENSDisplay Brightness (ANSI lumens) 3600 Native Resolution SVGA (800x600) Native Aspect Ratio 04: 03 Contrast Ratio (FOFO) 20000: 1 Display Color 30 Bits (1,07 billion colors) Light Source Lamp Light Source Life ECO 10000 hrs, LampSave 15000 hrs, Normal 5000 hrs, SmartEco 10000 hrs Optical Throw Ratio 1. 96~2. 15 Zoom Ratio 1. 1x Lens F # = 2. 56 ~ 2. 68, f=22~24. 1mm Projection Offset (Full Height) 110% Keystone Adjustment 1D, Vertical 30 degrees