Epson PowerLite 8150i Administrator's Manual - Page 114

note The formulas given here are for when the projector is placed flat, without tilting it up at the screen (see page 17). If you tilt it up by extending the feet or use electronic keystone correction, your image size may vary. Image Size and Projection Distance Use the formulas given below either to find out how large your image will be when you know the distance from the projector to the screen, or to find out how far from the screen to place the projector if you want an image of a certain size. Since the size of the image can be changed by rotating the zoom ring, formulas are given for calculating both the minimum and maximum sizes. Standard Lens To determine the diagonal size of an image when you know the projection distance: s Inches: Maximum diagonal size = (0.6676 × projection distance) + 1.8 Minimum diagonal size = (0.5173 × projection distance) + 1.4 s Centimeters: Maximum diagonal size = (0.6676 × projection distance) + 4.6 Minimum diagonal size = (0.5173 × projection distance) + 3.6 To determine the projection distance when you know the diagonal size of the screen image: s Inches: Maximum projection distance = (1.498 × diagonal size) - 2.7 Minimum projection distance = (1.933 × diagonal size) - 2.7 s Centimeters: Maximum projection distance = (1.498 × diagonal size) - 6.9 Minimum projection distance = (1.933 × diagonal size) - 6.9 Long Throw Zoom Lens (ELPLL02) To determine the diagonal size of an image when you know the projection distance: s Inches: Maximum diagonal size = (0.487 × projection distance) + 2.3 Minimum diagonal size = (0.286 × projection distance) + 1.5 s Centimeters: Maximum diagonal size = (0.487 × projection distance) + 5.9 Minimum diagonal size = (0.286 × projection distance) + 3.7 112 Technical Specifications