Visual Systems Division
Technical Bulletin
MultiSync
LT80 Installation Data
Desk Top and Ceiling Mount
Page1
Contents
Notes and Formulas Page 1
Projection Distances and Screen Sizes
Ceiling Mount Page 2
Desktop Setup Page 3
Cabinet Dimensions Page 4
Ceiling Mount Dimensions Page 5
Notes
§
For Screen Sizes of 24 to 300 inches not indicated on the projection tables, use the formulas below.
§
Set the projection distance based on the width of the screen.
§
If the figures on the tables do not match the figures in the formulas, use the figures in the table.
§
All dimensions are in inches. Multiply by 25.4 for millimeters.
§
Distances may vary +/- 5%.
Formulas
Units: Inches
A
= C / COS
α
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
αα
= TAN
-1
((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
αα
= Offset Angle of image path center line with reference to desktop or ceiling
