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20 Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
PRE
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IMINAR
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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
Throw Distance Ranges - VX-40d/-50d: Table 3-3 lists the available lens options for
the VX-40d/-50d and their associated throw ratios.
➤
Table 3-3. VX-40d/-50d Lens Options and Throw Ratios
Lens Option (Note 2)
Throw Ratio
(Throw Dist. ÷
Screen Width)
Throw Distance Range
(in inches, with 100-inch Wide Screen)
Minimum Maximum
Telesto A 0.8 (Fixed) For rear-screen installations only. Contact
Runco Technical Support for more information.
Telesto B 1.65 - 1.95 165 195
Telesto C 2.04 - 2.73 204 273
Telesto C with CineWide 1.55 - 2.01 155 201
Telesto D 2.86 - 4.83 286 483
Telesto D with CineWide 2.17 - 3.60 217 360
Telesto E 4.96 - 7.90 496 790
Telesto E with CineWide 3.76 - 5.90 376 590
Notes:
1. Throw distance does not affect image quality, provided these ranges are taken into account.
2. Only the Telesto 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
VX-40d/-50d Throw Ratio: refer to Table 3-3
VX-60d/-80d Throw Ratio: refer to Table 3-4