Digital Projection Mercury Quad Series, Installation And Quick Start Manual

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page 95
Digital Projection Mercury Quad Series
Reference Guide
CHOOSING A LENS
Rev A March 2017
Full lens calculation example
Your screen is 4.5 m wide; you wish to place the projector
approximately 11 m from the screen. The source is 4:3 .
1. Calculate TRC as follows:
1.6
1.33
TRC = = 1.2
2. Calculate the throw ratio:
11
4.5 x 1.2
Throw ratio = = 2.04
3. Find a match in the lens table.
The table shows that the matching lens is the 1.87 - 2.56 : 1
zoom lens .
4. 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
INFORMATION YOU NEED FOR THESE CALCULATIONS
•
The TRC formula
•
The TRC table (to use instead of the formula)
2.35:1 (Scope) TRC not used
1.85:1 (Flat) TRC not used
1.78:1 (16:9) TRC not used
1.66:1 (Vista)
TRC not used
1.6:1 (16:10) TRC not used (native resolution)
1.33:1 (4:3) TRC = 1.2
1.25:1 (5:4) TRC = 1.28
•
The throw ratio formula
•
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)
DMD™ aspect ratio
Source aspect ratio
TRC =
Throw distance
Screen width x TRC
Throw ratio =