Throw Distance; Estimating Throw Distance - Runco Video Xtreme VX-40d Owner's Operating Manual

Installation

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.

Estimating Throw Distance

Throw Distance (TD) = Screen Width (w) x Lens Throw Ratio
VX-40d/-50d Throw Ratio: refer to Table 3-3
VX-60d/-80d Throw Ratio: refer to Table 3-4
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)
Telesto A
Telesto B
Telesto C
Telesto C with CineWide
Telesto D
Telesto D with CineWide
Telesto E
Telesto E with CineWide
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.
T D
Throw Ratio
÷
(in inches, with 100-inch Wide Screen)
(Throw Dist.
Screen Width)
0.8 (Fixed) For rear-screen installations only. Contact
Runco Technical Support for more information.
1.65 - 1.95
2.04 - 2.73
1.55 - 2.01
2.86 - 4.83
2.17 - 3.60
4.96 - 7.90
3.76 - 5.90
20 Runco VX-40d/-50d/-60d/-80d Owner's Operating Manual
Throw Distance Range
Minimum Maximum
165
204
155
286
217
496
376
195
273
201
483
360
790
590