1. QVD (7:1) Lens Kit
1.5 Lens Formulas
Lens Formulas
Image 1-4
To calculate the distance between the projector frontside and the screen (PD) for a given screenwidth (SW), use the following for-
mula:
Panels
Metric formula (PD and SW in meter)
Inch formula (PD and SW in inch)
1.3”
PD=0.013+6.0.005/SW
PD=0.51+6.7.75/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 or scratching exposed lens surface, we have de-
veloped recommendations for cleaning the lens. FIRST, we recommend you try to remove any material from
the lens by blowing it off with clean, dry 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.
How to clean the lens ?
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 back 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 pocket, 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 washing the cleaning cloth or softener sheets when drying the cloth.
Do not use liquid cleaners on the cloth as doing so will contaminate the cloth.
Other lenses can also be cleaned safely with this Toraysee
TM
cloth.
R5976393 QVD (7:1) LENS KIT 28012004
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