User Manual
Page 17
... it best suits your projector 17 Screen Size Screen Center of this projector's optical characteristics. BenQ recommends that it , so as to make allowance for the center of lens dimensions of lens Vertical offset Projection distance Screen Size Diagonal W Inches mm (mm) 30 762 610 40 1016 813 50 1270...251 286 343 There is 3% tolerance among these numbers due to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before calculating the appropriate position. Positioning your installation location.
... it best suits your projector 17 Screen Size Screen Center of this projector's optical characteristics. BenQ recommends that it , so as to make allowance for the center of lens dimensions of lens Vertical offset Projection distance Screen Size Diagonal W Inches mm (mm) 30 762 610 40 1016 813 50 1270...251 286 343 There is 3% tolerance among these numbers due to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before calculating the appropriate position. Positioning your installation location.