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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 theposition of the projector in the projection room with regard to the screen and measure the projector-screen distance
(PD).
3. Use the lens formulas (see "Lens formulas", page 22) 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
Metric formulas (meter) Inch formulas (inch)
TLD (0.8 : 1)
TLD HB (0.8 : 1)
0.75
PD = (0.77 x SW ) + 0.05 PD = (0.77 x SW ) + 1.97
TLD (1.2 : 1)
1.1
PD=(1.11xSW)-0.01 PD=(1.11xSW)-0.39
TLD+(1.2:1)
1.2
PD= (1.23 x SW) + 0.11 PD = (1.23 x SW) + 4.33
TLD (1.6 – 2.0 : 1)
TLDHB(1.6–2.0
:1)
1.45 – 1.85
PD
min
= (1.47 x SW ) - 0.09
PD
max
= (1.85 x SW ) - 0.13
PD
min
= (1.47 x SW ) - 3.54
PD
max
= (1.85 x SW ) - 5.12
TLD (2.0 – 2.8 : 1)
TLDHB(2.0–2.8
:1)
1.82 – 2.55
PD
min
= (1.85 x SW ) - 0.17
PD
max
= (2.62 x SW ) - 0.24
PD
min
= (1.85 x SW ) - 6.69
PD
max
= (2.62 x SW ) - 9.45
TLD (2.8 – 5.0 : 1)
TLDHB(2.8–5.0
:1)
2.55 – 4.55
PD
min
= (2.58 x SW ) - 0.16
PD
max
= (4.71 x SW ) - 0.38
PD
min
= (2.58 x SW ) - 6.30
PD
max
= (4.71 x SW ) - 14.96
22 R5976921 FLM R20+ PERFORMER 15/03/2010