Screen size and projection distance, When using a wide screen (16:9), When using a normal screen (4:3) – Knoll Systems Front Projector 1080p DLP User Manual
Page 23: Conn ec tions and setu p
22
CONN
EC
TIONS AND SETU
P
Screen Size and Projection Distance
(Short throw lens)
When using a wide
screen (16:9)
In case of displaying the
16:9 picture on the whole
area of the 16:9 screen.
When using a normal
screen (4:3)
In case of setting the
16:9 picture to the full
horizontal width of the 4:3
screen.
The formula for screen size and projection distance
Wide Screen 16:9
Screen Size
Throw Distance
Center of lens to edge of
screen bottom
Diagonal
Wide
High
Max
Min
Up
down
in
cm
in
cm
in
cm
ft
m
ft
m
ft
cm
ft
cm
300.0
762.0
261.5
664.1
147.1
373.6
36.2
11.0
29.0
8.8
0.0
0.0
-9.8
-298.9
250.0
635.0
217.9
553.5
122.6
311.3
30.1
9.2
24.1
7.4
0.0
0.0
-8.2
-249.1
200.0
508.0
174.3
442.8
98.1
249.1
24.1
7.3
19.3
5.9
0.0
0.0
-6.5
-199.2
150.0
381.0
130.7
332.1
73.5
186.8
18.1
5.5
14.5
4.4
0.0
0.0
-4.9
-149.4
133.0
337.8
115.9
294.4
65.2
165.6
16.0
4.9
12.8
3.9
0.0
0.0
-4.3
-132.5
106.0
269.2
92.4
234.7
52.0
132.0
12.8
3.9
10.2
3.1
0.0
0.0
-3.5
-105.6
100.0
254.0
87.2
221.4
49.0
124.5
12.1
3.7
9.7
2.9
0.0
0.0
-3.3
-99.6
92.0
233.7
80.2
203.7
45.1
114.6
11.1
3.4
8.9
2.7
0.0
0.0
-3.0
-91.7
84.0
213.4
73.2
186.0
41.2
104.6
10.1
3.1
8.1
2.5
0.0
0.0
-2.7
-83.7
72.0
182.9
62.8
159.4
35.3
89.7
8.7
2.6
7.0
2.1
0.0
0.0
-2.4
-71.7
60.0
152.4
52.3
132.8
29.4
74.7
7.2
2.2
5.8
1.8
0.0
0.0
-2.0
-59.8
50.0
127.0
43.6
110.7
24.5
62.3
6.0
1.8
4.8
1.5
0.0
0.0
-1.6
-49.8
Y1 (Max.) = 0.12057x
Y2 (Min.) = 0.09660x
Z1 (Upper) = 0.00000x
z2 (Lower) = -0.03268x
x : Screen size (diag.)
y : Projection distance
z : Distance from the lens center to the
lower edge of the image
Note
• There is a tolerance of ±3% in the formula above.
• Values with a minus (-) sign indicate the distance of the lens center below the
bottom of the image.
9
16
: Picture area
The formula for screen size and projection distance
Standard Screen 4:3
Screen Size
Throw Distance
Center of lens to edge of
screen bottom
Diagonal
Wide
High
Max
Min
Up
down
in
cm
in
cm
in
cm
ft
m
ft
m
ft
cm
ft
cm
300.0
762.0
240.0
609.6
180.0
457.2
33.2
10.1
26.6
8.1
0.0
0.0
-12.0
-365.8
250.0
635.0
200.0
508.0
150.0
381.0
27.7
8.4
22.2
6.8
0.0
0.0
-10.0
-304.8
200.0
508.0
160.0
406.4
120.0
304.8
22.1
6.7
17.7
5.4
0.0
0.0
-8.0
-243.8
150.0
381.0
120.0
304.8
90.0
228.6
16.6
5.1
13.3
4.1
0.0
0.0
-6.0
-182.9
133.0
337.8
106.4
270.3
79.8
202.7
14.7
4.5
11.8
3.6
0.0
0.0
-5.3
-162.2
106.0
269.2
84.8
215.4
63.6
161.5
11.7
3.6
9.4
2.9
0.0
0.0
-4.2
-129.2
100.0
254.0
80.0
203.2
60.0
152.4
11.1
3.4
8.9
2.7
0.0
0.0
-4.0
-121.9
92.0
233.7
73.6
186.9
55.2
140.2
10.2
3.1
8.2
2.5
0.0
0.0
-3.7
-112.2
84.0
213.4
67.2
170.7
50.4
128.0
9.3
2.8
7.4
2.3
0.0
0.0
-3.4
-102.4
72.0
182.9
57.6
146.3
43.2
109.7
8.0
2.4
6.4
1.9
0.0
0.0
-2.9
-87.8
60.0
152.4
48.0
121.9
36.0
91.4
6.6
2.0
5.3
1.6
0.0
0.0
-2.4
-73.2
50.0
127.0
40.0
101.6
30.0
76.2
5.5
1.7
4.4
1.4
0.0
0.0
-2.0
-61.0
Y1 (Max.) = 0.11067x
Y2 (Min.) = 0.08867x
Z1 (Upper) = 0.00000x
Z2 (Lower) = -0.03268x
x : Screen size (in)
y : Projection distance (ft)
z : Distance from the lens center to the
lower edge of the image(in)
Note
• There is a tolerance of ±3% in the formula above.
• Values with a minus (-) sign indicate the distance of the lens center below the
bottom of the image.
3
4
: Screen area
: Picture area