Digital Projection Mercury Quad Series, Installation And Quick Start Manual

Page: 99 / 130

page 91
Digital Projection Mercury Quad Series
Reference Guide
CHOOSING A LENS
Rev A March 2017
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 11 m from the screen. The throw ratio will then be
11
4.5
=
2.44
2. Match the result with the lens table.
The lens matching a throw ratio of 2.44 is the 1.87 - 2.56 : 1
zoom lens .
3. Check whether the lens covers the required throw distance.
The range quoted for the 1.87 - 2.56 : 1 zoom lens is
4 - 24 m
.
The required distance of 11 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 ratio Throw distance range
0.67:1 fixed lens 1.1 m - 10 m (3.6 ft - 33 ft)
1.12:1 fixed lens 3 m - 15 m (9.8 ft - 49.2 ft)
1.16 - 1.49:1 zoom lens 3 m - 15 m (9.8 ft - 49.2 ft)
1.39 - 1.87:1 zoom lens 4 m - 24 m (13.1 ft - 78.7 ft)
1.87 - 2.56:1 zoom lens 4 m - 24 m (13.1 ft - 78.7 ft)
2.56 - 4.16:1 zoom lens 9.1 m - 45 m (29.9 ft - 147.6 ft)
4.16 - 6.96:1 zoom lens 12 m - 80 m (39.3 ft - 262.5 ft)
6.92 - 10.36:1 zoom lens 12 m - 80 m (39.3 ft - 262.5 ft)