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3. Physical installation
Image 3-15
R9840910: TLD zoom lens (5.0 - 8.0 : 1) ; R9842120:
TLD HB zoom lens (5.0 - 8.0 : 1)
Image 3-16
R9829997: TLD+ zoom lens (7.5 - 11.2 : 1)
3.2.2 Lens selection
How to select the right lens for your application ?
1. Determine the required screen width (SW).
2. Determine the position ofthe projector in the projection room with regard to thescreen and measure the projector-screen distance
(PD).
3. Use the lens formulas to find the best corresponding PD with regard to the measured projector-screen distance for the required
screen width SW.
Tip: Divide PD by SW to determine the approximate throw ratio. Choose a Lens, which captures the calculated throw ratio.
Use the lens formula of the chosen Lens to recalculate exactly.
SCREEN
PD
SW
Image 3-17
3.2.3 Lens formulas
Formulas
Lens
Throw ratio for
FLM HD
Metric formulas (meter) Inch formulas (inch)
TLD (0.8 : 1)
TLD HB (0.8 : 1)
0.7
PD = (0.71 x SW ) + 0.05 PD = (0.71 x SW ) + 1.97
TLD (1.2 : 1)
1.1
PD = (1.03 x SW ) - 0.01 PD = (1.03 x SW ) - 0.39
TLD+(1.2:1)
1.2
PD= (1.14 x SW) + 0.11 PD = (1.14 x SW) + 4.33
TLD (1.6 – 2.0 : 1)
TLDHB(1.6–2.0
:1)
1.35 – 1.70
PD
min
= (1.36 x SW ) - 0.09
PD
max
= (1.71 x SW ) - 0.13
PD
min
= (1.36 x SW ) - 3.54
PD
max
= (1.71 x SW ) - 5.12
TLD (2.0 – 2.8 : 1)
TLDHB(2.0–2.8
:1)
1.70 – 2.42
PD
min
= (1.71 x SW ) - 0.17
PD
max
= (2.42 x SW ) - 0.24
PD
min
= (1.71 x SW ) - 6.69
PD
max
= (2.42 x SW ) - 9.45
TLD (2.8 – 5.0 : 1)
TLDHB(2.8–5.0
:1)
2.42 – 4.35
PD
min
= (2.38 x SW ) - 0.16
PD
max
= (4.35 x SW ) - 0.38
PD
min
= (2.38 x SW ) - 6.30
PD
max
= (4.35 x SW ) - 14.96
22 R5976986 FLM HD18 15/03/2010