Adjusting The Projector Zoom / Focus; Adjusting Projected Image Size - Optoma EP1690 Manual

Adjusting the Projector Zoom / Focus

You may turn the zoom lever to zoom in or out. To focus
the image, rotate the focus ring until the image is clear. The
projector will focus at distances from 4.9 to 39.4 feet (1.5 to
12.0 meters) and the projection screen size from 0.92m~8.97m
(36"~353") at 16:10 mode with mechanical travel.
Adjusting Projection Image Size
Throw Ratio (TR)=1.96 as Wide mode
A=6.52° B (1280x768)=25.54°
H'=L X tan(A)
H (1280x768)=W (1280x768) X 0.86
0
Display Format A B
16:10 (1280x768) 6.52 25.54
4:3 (1024x768) 6.52 25.54
Projection Distance (M) 2.0
Max 58.8
Screen Size 16:10
Diagonal (inch)
Min 48.9
Max 47.0
Screen Size 4:3
Diagonal (inch)
Min 39.5
This graph is for user's reference only.
Installation
B
(1280X768)
A
L
W (1280x768)=L/R
0
W (1024x768)=W (1280x768) X 0.8
1 0
H (1024x768)=W (1024x768) X 0.75
1
L W H H'
(cm) (cm) (cm) (cm)
256 130.68 78.41 29.01 152.40
256 104.52 78.41 29.01 130.66
2.5 3.0 3.5 4.0
73.5 88.2 102.8 117.5 146.9
61.1 73.3 85.5 97.7 122.2
55.8 70.5 82.3 94.0 117.6
49.4 59.2 69.1 79.0
Zoom Lever
Focus Ring
W
(1024X768)
1
W
(1280X768)
0
D
(1280X768)
D D'
(cm) (in)
60.00
51.44
5.0 6.0 8.0 10.0
176.3 235.1 293.9
146.6 195.5 244.4
141.1 207.7 259.6
98.7 118.4 172.7 215.9
English
17
12.0
352.6
293.2
311.5
259.0