Digital Projection M-Vision 930 3D Series, Инструкция по установке и быстрому запуску

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page 75
Digital Projection M-Vision 930 Series
Reference Guide
CHOOSING A LENS
Rev C February 2015
Basic calculation
Identify the required lens by calculating the throw ratio .
A throw ratio is the ratio of the throw distance to the screen width:
Throw distance
Screen width
Throw ratio =
1. Use the formula above to obtain the required throw ratio.
2. Match the throw ratio with a lens from the table below:
Throw ratios Throw distance range
0.84 - 1.03 : 1 zoom lens 1.5 - 10 m (4.9 - 32.8 ft)
1.56 - 1.86 : 1 zoom lens 2 - 12.4 m (6.6 - 40.7 ft)
1.85 - 2.40 : 1 zoom lens 2.5 - 15.9 m (8.2 - 52.2 ft)
2.40 - 4.00 : 1 zoom lens 4 - 26.6 m (13.1 - 87.3 ft)
3. Ensure the required throw distance is within the range covered
by the lens.
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.
When calculating the throw ratio, be
sure to use identical measurement
units for both the throw distance and
the screen width.
For information about individual lens
part numbers and lens extension
sizes, see Appendix A at the end of
this document.
1
2
1
Screen width
2
Throw distance