3. Physical Installation
3.7 Throw distance
Calculate the installation throw distance
Throw is the distance (D) measured from y our projector lens to the screen. To calculate the throw distance for an installation, you
will need two pieces of data: the selected lens throw ratio (L) and the horizontal w idth (W) of the s creen. F or example, if the screen
width (W) is 2.4 m eters and the projector lens has a throw ratio (L) of 0.99:1, then the throw distance (D) will be 2.38 m eters.
Calculation: 2.4 x 0.99 = 2.38
The following gr aphs illustrate the image size ( W ) and projection distan ce (D) for eac h of the projector l
enses.
Tolerances are typically +/- 5% due to optical (lens) variation.
Throw distance, FLD+ / 4K U HD
Projection distance
Image width
m
12.00
11.00
10.00
9.00
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
Screen diagonal
0.00
0.50
1.00
1.50
2.00
2.50
3.00
4.00
4.50
5.00
5.50
6.00
6.50
7.00
7.50
3.50
0.00
Image height
FLD+ Lens 0.8 : 1 (EN42) (0.7 - 7m)
FLD+ Lens 1.7 - 2.5 : 1 (EN41) (1.5 - 15m)
FLD+ Lens 2.5 - 4.6 : 1 (EN44) (2.5 - 25 m)
FLD+ Lens 1.2 - 1.7 : 1 (EN43) (1.5 - 15m)
FLD+ Lens 0.8 - 1.21 : 1 (EN46) (0.7 - 7m)
FLD+ Lens 0.65 : 1 (EN47) (0.5 - 4m)
FLD+ Lens 0.8 - 1.21 : 1 (EN45) (5 - 30m)
1.00
2.00
3.00
4.00
5.00
6.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
Image 3-4
3.8 Scheimpflug (Boresight) a djustment
What is Scheimpflug?
The lens holder has to be adjus ted so that the “sharp focus plane” of the projected image falls together with the plane of the screen
(Fp1→Fp2). This is achieved by changing the dis tance between the DMD plane and the lens plane (Lp1→Lp2). T he closer the lens
plane com es to the DMD pl
ane the further the sharp focus plane will be. It can occur that you won’t be able to get a complete focused
image on the s creen due to a tilt (or swing) of the lens plane with re spect to the DMD plane. This is also know n as Scheimpflug’s
law. To solve this the lens plane must be placed parallel with the D MD plane. This can b e achieved by turning the lens holder to
remove the tilt (or s
wing) between lens plane and DMD plane (Lp3→L p4).
24
601–0442 BALDER 13/09/2017
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