Digital Projection POWER 2v, User Manual

Page: 33 / 174

THROW DISTANCE - ZOOM LENSES
When using a zoom lens, exact positioning of the projector less important because
the image size can be adjusted. However, the projector must be located within the
Throw Distance range imposed by the minimum and maximum lens ratios and the
focus range of the lens.
If you intend to display images with different aspect ratios, it is recommended that
you define your own Throw Distance range from the ranges given for each Aspect
Ratio. To define the minimum value for your range, you must select the highest
minimum value from the ranges given for each aspect ratio you wish to display. To
define the maximum value for your range, you must select the lowest maximum
value from the appropriate ranges.
CALCULATING THE THROW DISTANCE
To calculate the distance between the screen and the front of the projector case
select your lens type from the following pages and use the tables provided. If your
screen size in not listed in these tables or included in the lens tables in Section D,
you will need to calculate the distance required using the following formula:-
Distance Required = ( W + A ) x ( C ÷ B )
Where W = Screen Width and A,B and C are constants from the tables below.
BÑ5
System Installation
INSTALLATION
LBV00018; Revision E - 28/01/98
Lens
1.27 Fixed
3.0 Fixed
5.0 Fixed
7.0 Fixed
1.5 - 3.0 Zoom at 1.5 position
1.5 - 3.0 Zoom at 3.0 position
3.0 - 7.0 Zoom at 3.0 position
3.0 - 7.0 Zoom at 7.0 position
SVGA Ultra Wide Angle
A
-0.0037
0.0034
-0.0269
-0.0286
0.0280
0.0082
-0.0175
-0.0253
0.0467
B
0.8140
0.3520
0.2097
0.1497
0.6807
0.3532
0.3545
0.1418
0.9909
Aspect Ratio
4 x 3
5 x 4
8 x 5
14 x 9
16 x 9
C
1.06
1.1307
1.0
1.0
1.0