3. Installation Guidelines
3.7 Lenses
Overview
• Lenses
• Lens selection
• Lens formulas
• Lens Installation
• Cleaning the lens
3.7.1 Lenses
Available lenses
TLD(1.6–2.0:1) R9840670
TLD(2.0–2.8:1) R9840680
TLD(2.8–5.0:1) R9840690
TLD(1.2:1) R9840770
TLD(0.8:1) R9840900
TLD(5.0–8.0:1) R9840910
TLD HB(0.8:1) R9842040
TLD HB(1.6–2.0:1) R9842060
TLD HB(2.0–2.8:1) R9842080
TLD HB(2.8–5.0:1) R9842100
TLD HB(5.0–8.0:1) R9842120
3.7.2 Lensselection
How to select ?
1. Determine the required screen width.
2. Determinethe approximate position of the projector in the projection room w ith regard to the screen and measure the projector-
screen distance (PD).
3. Use the lens formulas to find the best corresponding PD w ithr egard to the measured projector-screen distance for the required
screen width.
3.7.3 Lens formulas
Formulas for the standard TLD HB lenses
Metric formulas (meter) Inch formulas (inch)
TLD HB(0.8:1) PD=0.77xSW+0.05 PD=0.77SW+1.97
TLD HB(1.2:1) PD=1.11xSW-0.01 PD=1.11xSW-0.39
TLD HB(1.6–2.0:1) PDmin=1.47xSW-0.09
PDmax=1.85xSW-0.13
PDmin=1.47xSW-3.54
PDmax=1.85xSW-5.12
TLD HB(2.0–2.8:1) PDmin=1.85xSW-0.17
PDmax=2.62xSW-0.24
PDmin=1.85xSW-6.69
PDmax=2.62xSW-9.45
TLD HB(2.8–5.0:1) PDmin=2.58xSW-0.16
PDmax=4.71xSW-0.38
PDmin=2.58xSW-6.30
PDmax=4.71xSW-14.96
TLD HB(5.0–8.0:1) PDmin=4.52xSW-0.01
PDmax=7.53xSW-0.29
PDmin=4.52xSW-0.39
PDmax=7.53xSW-11.42
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