Throw Distance; Estimating Throw Distance - Runco CL-420 Owner's Operating 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 CL-410 has a lens throw ratio of between 1.37 and 1.67.
The CL-420 has a lens throw ratio of between 1.40 and 1.70.
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.
For example, with an 8-foot (96-inch) wide screen:
• The CL-410 has a throw distance range of between 131.5 inches (3.34 meters) and
160.3 inches (4.07 meters).
• The CL-420 has a throw distance range of between 134.4 inches (3.41 meters) and
163.2 inches (4.14 meters).
Estimating Throw Distance (TD)
CL-410:
Minimum TD = Screen Width x 1.37
Maximum TD = Screen Width x 1.67
CL-420:
Minimum TD = Screen Width x 1.40
Maximum TD = Screen Width x 1.70
Figure 3-2. Estimating Throw Distance
Runco CL-410 and CL-420 Owner's Operating Manual
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Installation

Throw Distance