page 47
Digital Projection INSIGHT 4K Dual LED & Quad Series
Reference Guide
CHOOSING A LENS
Rev B June 2016
Calculation example
1. Calculate the throw ratio using the formula.
Your screen is
4.5 m
wide and you wish to place your
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 1.65 - 2.60 : 1 zoom lens
3. Check whether the lens covers the required throw
distance.
11 m is comfortably within the throw range of the
1.65-2.60:1 lens.
INFORMATION YOU NEED FOR THIS CALCULATION
•
The throw ratio formula:
Throw distance
Screen width
Throw ratio =
•
The lens table:
Throw ratios
Throw distance range
0.93 : 1 fixed lens
0.5 m - 40 m (1.6 ft - 130 ft)
1.13 - 1.72 : 1 zoom lens 2.5 m - 40+ m (8.2 ft - 130+ ft) at 1.13:1
0.5 m - 40+ m (1.6 ft - 130+ ft) at 1.72:1
1.65 - 2.60 : 1 zoom lens 3.5 m - 40+ m (11.5 ft - 130+ ft) at 1.65:1
1.0 m - 40+ m (3.3 ft - 130+ ft) at 2.60:1
2.53 - 4.98 : 1 zoom lens 1.5 m - 40+ m (4.9 ft - 130+ ft) at 2.53:1
4.5 m - 40+ m (14.8 ft - 130+ ft) at 4.98:1
Notes
You can also use the information
in
to
choose a lens.
For information about individual lens
at the end of
this document.
