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- Measure the screen diagonal and take the nearest
value from the table.
- Calculate the ratio between the table value and the
relative width.
- Multiply the value obtained by the actual screen width.
Example:
Suppose we have a 105” screen diagonal. 100”
is the nearest value in the table.
Ihe A/Width ratio is equal to304:293.2=1,49.
A 105” screen diagonal is 213.3 wide.
So, the value of A is: 1,49x213,3=317.8 cm.
4.3.3 Desktop rear projection
For rear projection we recommend installing the projector
with the axis of the green lens orthogonal to the screen
plane; pay attention that the green lens be centered with
respect to the screen.
By using Fresnel lenses for rear projection, it is mandatory
to install the projector orthogonal to the centre of the
screen to achieve maximum brightness and a better per-
formance.
4.3.2 Desk-top front projection
Correct use of the spacers, as shown in the spacer tables,
is mandatory for a perfect focus uniformity. Check that
the projector is perfectly stable.
The projector bottom must be parallel with the floor
A = Distance between the front panel and the screen
B = Distance between the projector’s desktop line and
screen centre.
Note:
The screen size refers to the usable area (4/3
format).
When installing the projector, it is recommended to
increase by 5 cm the distance from the screen as indicated
in the table. The picture adjustment can be carried out
later through the deflection menu.
A greater distance produces a picture slightly bigger than
the screen, its dimension can be reduced during
installation by means of the deflection menu.
If the size of the screen diagonal is not given in the table,
dimension A (in cm) is determined as follows:
SCREEN SIZE A
Useful area 4/3
Diagonal Width Height
(Inches) (cm.) (cm.) (cm.)
60” 121,9 91,4 186
80” 165,5 121,9 245
90” 182,9 137,2 265
100” 203,2 152,4 304
120” 243,8 182,9 365
150” 304,8 228,6 455
180” 365,7 274,3 545
200” 406,4 304,8 600
250” 508,0 381,0 750
300” 609,6 457,2 900
C
SCREEN CENTRE
SCREEN
The distance between the projector and the screen
(depending on screen dimensions), is shown in the
following table.
TABLE 1: FRONT PROJECTION
The use of the correct spacers as shown in the spacers
table is mandatory for a perfect focus uniformity.
The distance between projector and screen is given in
the following table.
TABLE 2: DESKTOP REAR PROJECTION
C = Distance between the front panel and the screen.
B
A
SCREEN CENTRE
SCREEN
SCREEN SIZEO C
Useful area 4/3
Diagonal Width Height
(Inches) (cm.) (cm.) (cm.)
60” 121,9 91,4 188
80” 162,5 121,9 247
90” 182,5 137,2 275
100” 203,2 152,4 305
120” 243,8 182,9 370
150” 304,8 228,6 460
180” 365,7 274,3 550
200” 406,4 304,8 605
250” 508,0 381,0 755
300” 609,6 457,2 900