Throw Distance - Christie roadie 25k User Manual

Introduction
Throw Distance Formulas
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When planning a projector installation, consult this Appendix and/or use the Lens
Calculator available at the website. See also 2.3, Projector Position and Mounting.
Calculating Throw Distance
In this projector, throw distance is measured from the screen to the non-recessed
portion of the projector's front bezel. Determining an ideal throw distance depends
on the screen size and lens present at your site—the larger the image needed, the
greater the throw distance required. Once you know the screen size and lens type
present, you can calculate the required throw distance by using the appropriate
formula provided on page D-2, or by looking it up in the Table for this lens.
This measurement (see above) is not necessarily parallel to the floor—i.e., the
projector and screen may be inclined.
NOTES:1) If your projector is tilted up or down in relation to the screen, typical in
large venues and/or elevated installation, throw distance still represents the smallest
measurement between the screen and front bezel. 2) Remember that throw distances
provided in this Appendix are calculated from the screen to the front bezel of the
projector rather than its foot centers. To figure throw distance from foot centers, add
8.74" (22.2 cm).
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Table D.1 provides the throw distance formula for each lens. Once you know what
size screen you wish to fill, use the formula for the corresponding lens to calculate
the recommended throw distance. All formulas are in centimeters (cm).
NOTE: Minimum throw distance is 15 feet for all lenses except as noted.

Throw Distance

A p p e n d i x D
Roadie 25K User's Manual
D-1