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18 Vidikron Vision Model 120 Installation/Operation Manual
PRE
L
IMINAR
Y
Throw Distance Throw distance is the distance measured from the front of the projector to the screen. This is
an important calculation in any projector installation as it determines whether or not you
have enough room to install your projector with a desired screen size and if your image will
be the right size for your screen.
You can quickly estimate the throw distance by taking the width of the screen and
multiplying it by the lens throw ratio; see
Figure 3-1. The result of this calculation tells you
roughly how far back the projector should be positioned from the screen in order to project a
focused image large enough to fill the screen.
Figure 3-1. Estimating Throw Distance
Table 3-3 lists the available lens options for the Vision 120 and their associated throw ratios.
➤
Table 3-3. Vision 120 Lens Options and Throw Ratios
Lens Option
(Note 2)
Throw Ratio
with Primary
Lens Only
Throw Range in inches,
with 96x54-inch (1.78:1)
Screen
Throw Ratio
with Primary
Lens and
Anamorphic
Lens
Throw Range in inches,
with 126.9x54-inch
(2.35:1) Screen
Minimum Maximum Minimum Maximum
A1
0.70 Fixed 67.20
Not Applicable (Note 2)
A2
1.155 Fixed 110.88
B
1.42 - 1.79 136.32 171.84
C
1.86 - 2.51 178.56 240.96 1.42 - 1.88 180.20 238.57
D
2.67 - 4.19 256.32 402.24 2.03 - 3.13 257.61 397.20
E
4.32 - 6.98 414.72 670.08 3.15 - 5.48 399.74 695.41
Notes:
1. Throw distance does not affect image quality, provided these ranges are taken into account.
2. Only the C, D and E lenses can be used with the optional CineWide (secondary anamorphic) lens. Doing so
affects the throw distances as shown here.
Estimating Throw Distance
Throw Distance (TD) = Screen Width (w) x Lens Throw Ratio
Screen width (w)
TD