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1. QVD (7:1) Lens Kit
1.5 Lens Formulas
Lens Formulas
Image 1-4
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 formula (PD and SW in meter) Inch formula (PD and SW in inch)
1.3”
PD=0.013+6.842xSW+0.005/SW PD=0.51+6.842xSW+7.75/SW
1.4”
PD = 0.013 + 6.35xSW + 0.005/SW PD = 0.51 + 6.35xSW + 8.35/SW
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 follow :
1. Always wipe lenses with a CLEAN Toraysee
TM
cloth.
2. Always wipe lenses in a single direction.
Warning: Do not wipe bac
k and forwards across the lens surface as this tends to grind dirt into the coating.
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.
Other lenses can also be cleaned safely with this To raysee
TM
cloth.
R5976393 QVD (7:1) LENS KIT 28012004 5