Throw Distance; Estimating Throw Distance - Runco VX-33I VX-33I Installation & Operation Manual

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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.

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-33i and their associated throw ratios.
Table 3-3. VX-33i Lens Options and Throw Ratios
Throw Ratio
Lens Option
with Primary
(Note 2)
Lens Only
Apollo B
1.40 - 1.81
Apollo C
1.85 - 2.53
Apollo D
2.65 - 4.20
Notes:
1. Throw distance does not affect image quality, provided these ranges are taken into account.
2. Only the Apollo C and D 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
134.40 173.76
177.60 242.88
254.40 403.20
16
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)
1.40 - 1.90 177.66
2.02 - 3.15 256.34
Runco VX-33i Installation/Operation Manual
Maximum
241.11
399.73