NEC
Solutions
(America),
Inc.
Visual Systems
LT260/260K Installation Guide
Desktop and Ceiling Mount
v3.5
Contents
Product Description, Lens Specs, Notes and Formulas
Page 1
Projection Distances and Screen Sizes
Ceiling
Mount
Installation
Page 2
Desktop Setup
Page 3
Cabinet Dimensions
Top,
Front
and
Right
Side Page 4
Bottom,
Back
and
Left
Side
Page 5
Ceiling
Mount
Dimensions Page 6
Control Codes
Page 7
Product
Description
Type:
1
chip
DLP
TM
projector Dimensions:
10.24”(W)
x
4.74”(H)
x
11.81”(D)
Native
Resolution: 1024
x
768
(XGA) Weight: 6.5
lbs
Brightness: LT260:
2100
ANSI
LT260K:
2400
ANSI
Lens Specifications
Throw
Ratio:
2.0
-
2.4:1(approx.) Focal
Length:
28.4mm
–
34.0mm
Offset
Angle:
12.3
°
-14.9
°
(approx.)
F/#: 2.2
–
2.5
Screen
Sizes:
30”-500”
Manual
Focus/Manual
Zoom
Notes
For screen sizes not indicated on the projection charts, use the formulas below.
If a value in a chart does not match the results of the formulas, use the values in the chart.
The ceiling must be strong enough to support the projector and the installation must be in accordance with any local
building codes.
All formulas are based on a 4:3 aspect ratio and screen.
4:3 sources can be displayed on a 16:9 screen without vertical “squeezing”, see “Aspect Ratio” in the user manual.
Distances are in inches, for millimeters multiply by 25.4.
•
Distances may vary
±
5%.
Formulas
Units: Inches
(for millimeters multiply final number by 25.4)
Projection Formulas:
Definitions:
B
=
0.5265H
–
0.013
H
= Horizontal Screen Width (4:3)
C
(wide) = 2.0062H – 1.764
V
= Vertical Screen Height (4:3)
C
(tele) = 2.4281H – 1.260
B
= Vertical distance between lens center and screen center
D
=
0.1515H
-
0.013
C
= Throw distance
α
(wide) = tan
-1
(B/C(wide))
D
= Vertical distance between lens center and screen top
α
(tele) = tan
-1
(B/C(tele))
(screen
bottom
for
desktop
application)
α
= Throw Angle
Screen Formulas (4:3):
H
= Screen Diagonal x 4/5
V
= Screen Diagonal x 3/5
Screen Diagonal
= H x 5/4
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LT260/260K
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