NEC MultiSync LT80 Installation Data

Visual Systems Division
Technical Bulletin
MultiSync LT80 Installation Data
Desk Top and Ceiling Mount
Contents
Notes and Formulas
Projection Distances and Screen Sizes
Ceiling Mount
Desktop Setup
Cabinet Dimensions
Ceiling Mount Dimensions
Notes
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For Screen Sizes of 24 to 300 inches not indicated on the projection tables, use the formulas below.
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Set the projection distance based on the width of the screen.
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If the figures on the tables do not match the figures in the formulas, use the figures in the table.
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All dimensions are in inches. Multiply by 25.4 for millimeters.
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Distances may vary +/- 5%.
Formulas
Units: Inches
A = C / COS
B = ((H x 1.25) - 0.2) x 3 / 25.4
C (WIDE) = ((H x 12.5 / 243) - 0.06) x 39.37
C (TELE) = ((H x 12.5 / 187) - 0.06) x 39.37
-1
= TAN ((H x 0.375) + B) / C
H = Width of screen
A = Distance between lens center and screen center
B = Vertical distance between lens center and screen bottom (screen top for ceiling mount)
C = Horizontal throw distance between screen surface and projector lens
= Offset Angle of image path center line with reference to desktop or ceiling
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