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1. QVD (1.3–1.8:1) Lens Kit
1.5 Lens Formulas
Lens Formulas
Image 1-5
To calculate the distance between t he projector frontside and the screen (PD) for a given screenwidth (SW), use th e following for-
mula:
Panels
Metric formulas (PD and SW in meter) Inch formu las (PD and SW in inch)
1.3”
PD
min
=0.019+1.310xSW+0.026/SW
PD
max
=-0.001+1.706xSW+0.069/SW
PD
min
=0.75+1.310xSW+40.3/SW
PD
max
=-0.04+1.706xSW+107/SW
1.4”
PDmin = 0.019 + 1.216xSW + 0.028/SW
PDmax = -0.001 + 1.58 4xSW + 0.074/SW
PDmin = 0.75 + 1.216xSW + 43.4/SW
PDmax = -0.04 + 1.584xSW + 115/SW
PD
min
: Minimal projection distance
PD
max
: Maximal projection distance
SW
min
: 1m (39.37inch)
SW
max
: 6m (236.22inch)
1.6 Cleaning the lens
To minimize the possibility of damaging the optical coating o r scratching exposed lens surface, we have de-
veloped recommendations for cleaning the lens. FIRST, we recommend you try to remove any m aterial from
the lens by blowing it off with clean, d ry deionized air. DO NOT use any liquid to clean the lenses.
Necessary tools
Toraysee
TM
cloth ( delivered together with the lens kit). Order number : R379058.
Howtocleanthelens?
Proceed as fo
llow :
1. Always wipe lenses with a CLEAN Toraysee
TM
cloth.
2. Always wipe len
ses in a single direction.
Warning: Do not wipe back and forwards across the lens surface as this tends to grind dirt into the coa ting.
3. Do not leave cleaning cloth in either an open room or lab coat p ocket, as doing so can contaminate the cloth.
4. If smears occur when cleaning lenses, replace the cloth. Smears are the first indication of a dirty cloth.
Do not use fabric softener when w ashing the cleaning cloth or softener sheets when drying the cloth.
Do not use liquid cleaners on the cloth as doing so will contaminate th e cloth.
R5976390 QVD (1.3–1.8:1) LENS KIT 28012004 5