Visual Systems Division
Technical Bulletin
MultiSync
MT820/MT1020 Installation Data
Desk Top and Ceiling Mount
Page1
Contents
Notes and Formulas Page 1
Projection Distances and Screen Sizes
Ceiling Mount (Lens Wide) Page 2
Ceiling Mount (Lens Telephoto) Page 3
Desktop Setup (Lens Wide) Page 4
Desktop Setup (Lens Telephoto) Page 5
Cabinet Dimensions Page 6
Ceiling Mount Dimensions Page 7
Notes `
§
For Screen Sizes of 60 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.
Formulas
Units: Inches
Units: Millimeters
M
= 1.25 x W / 33.02
M
= 1.25 x W / 1.3
A
= C / COSINE
α
A
= C / COSINE
α
B
= (8 x M) + 5.598
B
= (8 x M) + 142.2
C
(Zoom Wide) = (53.2 x M) - 3.37
C
(Zoom Wide) = (53.2 x M) - 85.609
C
(Zoom Telephoto) = C (Zoom Wide) x 1.3055
C
(Zoom Telephoto) = C (Zoom Wide) x 1.3055
D
= (3 x W / 8) - E
D
= 25.4 x (3 x W / 8) - E
E
= (8 x M) + 3.433
E
= (8 x M) + 87.2
α
α
= TAN
-1
((E - 3.433) / C)
α
α
= TAN
-1
((E - 87.2) / C)
W
= Width of Screen
A
= Distance between lens center and screen center
B
= Vertical distance between top of NEC ceiling mount and screen center
C
= Horizontal throw distance between screen surface and projector lens
D
= Vertical distance between projector base and screen bottom
E
= Vertical distance between desk top level and screen center
