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Digital Projection M-Vision Laser 18K Series
Reference Guide
CHOOSING A LENS
Rev D October 2019
Basic calculation example
1. Calculate the throw ratio using the formula.
Your screen is 4.5 m wide and you wish to place the projector
approximately 10 m from the screen. The throw ratio will then be
11
4.5
= 2.22
2. Match the result with the lens table.
The lens matching a throw ratio of 2.22 is the 2.00 - 4.00 : 1
zoom lens.
3. Check whether the lens covers the required throw distance.
The focus range quoted for the 2.00 - 4.00 : 1 zoom lens is 2.5 -
15 m. The required distance of 10 m is within the range.
Notes
The lens table shown on this page
includes High Brightness lenses
only. For a full list, see Appendix A
at the end of this document.
The basic calculation on this page
does not take into consideration
DMD™ and image size, which could
aff ect 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 Focus range
1.20 - 1.56 : 1 zoom 1 m - 8 m
1.50 - 2.00 : 1 zoom 2 m - 12 m
2.00 - 4.00 : 1 zoom 2.5 m - 15 m
4.00 - 7.00 : 1 zoom 4 m - 42 m
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