BenQ Joybee GP1 GP1 User Manual - Page 14
Projection dimensions, Positioning your projector, 600 screen diagonal, Projection distance
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Projection dimensions Refer to "Dimensions" on page 56 for the center of lens dimensions of this projector before calculating the appropriate position. 858:600 screen diagonal Screen Center of lens Projection distance 858:600 screen diagonal Feet Inches mm 1.25 15 381 2.50 30 762 3.75 45 1143 5.00 60 1524 6.67 80 2032 Recommended projection distance from screen in mm Average 600 1200 1800 2400 3200 There is 3% tolerance among these numbers due to optical component variations. BenQ recommends that if you intend to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before you permanently install it, so as to make allowance for this projector's optical characteristics. This will help you determine the exact mounting position so that it best suits your installation location. 14 Positioning your projector
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