Throw Distance; Estimating Throw Distance - Runco RS 440LT/CineWide User Manual

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 3-2. 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 3-2. Estimating Throw Distance
Table 3-3 gives the throw ratios for the RS-440 Series.
Table 3-3. Throw Ratios for the RS-440 Series
Throw
Ratio with
Projector Model
Primary
Lens Only
RS-440 1.36 - 1.70
RS-440LT
1.69 - 2.13
RS-440LT/CineWide
Runco RS-440 Installation/Operation Manual
T D
Throw Range in
Throw Ratio
inches, with
with Primary
72.6x40.8-inch
Lens and
(1.78:1) Screen
Anamorphic
Minimum Maximum
98.74 123.42
122.69 154.63
(n/a) 1.69 - 2.13
Throw Range in
inches, with
96x40.8-inch (2.35:1)
Screen
Lens
Minimum Maximum
(n/a)
(n/a)
162.24 204.48
15
Installation

Throw Distance