Throw Distance; Estimating Throw Distance - Runco Video Xtreme VX-44d Installation & Operation Manual

Installation

Throw Distance

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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
Figure 3-1. Estimating Throw Distance
Table 3-3 lists the available lens options for the VX-44d/-55d and their associated throw
ratios.
Table 3-3. VX-44d/-55d Lens Options and Throw Ratios
Throw Ratio
Lens Option
with Primary
(Note 2)
Lens Only
Telesto B
1.37 - 1.64
Telesto C
1.69 - 2.27
Telesto D
2.38 - 4.00
Telesto E
4.18 - 6.60
Notes:
1. Throw distance does not affect image quality, provided these ranges are taken into account.
2. Only the Telesto 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 Range in
inches, with
96x54-inch (1.78:1)
Screen
Minimum Maximum
131.52 157.44
162.24 217.92
228.48 384.00
401.28 633.60
20 Runco VX-44d/-55d Installation/Operation Manual
Throw Range in
Throw Ratio
inches, with
with Primary
126.9x54-inch (2.35:1)
Lens and
Screen
Anamorphic
Lens
Minimum
Not Applicable (Note 2)
1.79 - 3.09 227.15
3.18 - 5.06 403.54
Maximum
392.12
642.11