Digital Projection Titan 930, User Manual

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Digital Projection
M-Vision 930 Series
CHOOSING A LENS Reference Guide
82 Rev A January 2014
Basic calculation example
1. Calculate the throw ratio using the formula.
Your screen is 3.5 m wide and you wish to place the projector
approximately 6.8 m from the screen. The throw ratio will then
be
6.8
3.5
= 1.94
2. Match the result with the lens table.
The lens matching a throw ratio of 1.94 is the 1.85 - 2.40 : 1
zoom lens .
3. Check whether the lens covers the required throw distance.
The range quoted for the 1.85 - 2.40 : 1 zoom lens is 2.5 - 10 m .
The required distance of 6.8 m is within the range.
Notes
The basic calculation on this page
does not take into consideration
DMD™ and image size, which could
affect the throw ratio. For a more
complex and realistic calculation,
see Full lens calculation in this
section.
For information about individual lens
part numbers, see Appendix A at
the end of this document.
INFORMATION YOU NEED FOR THIS CALCULATION
•
The throw ratio formula:
Throw distance
Screen width
Throw ratio =
•
The lens table:
Throw ratios Throw distance range
0.84 - 1.03 : 1 zoom lens 1.5 - 4 m (4.9 - 13.1 ft)
1.56 - 1.86 : 1 zoom lens 2 - 7 m (6.6 - 23 ft)
1.85 - 2.40 : 1 zoom lens 2.5 - 10 m (8.2 - 32.8 ft)
2.40 - 4.00 : 1 zoom lens 4 - 12 m (13.1 - 39.4 ft)