Digital Projection HIGlite 8000 Series, User Manual

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Digital Projection
HIGHlite 8000 Series
CHOOSING A LENS Reference Guide
50 Rev F July 2014
Full lens calculation example
Your screen is 4.5m wide; you wish to place the projector
approximately 11m from the screen. You use a WUXGA
projector; 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 1.74 - 2.17 : 1
zoom lens .
4. Check whether the lens covers the required throw distance.
The range quoted for the 1.74 - 2.17 : 1 zoom lens is 2.2 -
11.8m . The required distance of 11m is within the range.
Notes
INFORMATION YOU NEED FOR THESE CALCULATIONS
•
The TRC formula
•
The TRC table (to use instead of the formula)
HIGHlite 8000 WUXGA
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 ratios Throw distance range
0.77 : 1 fixed lens 1.3 - 2.5 m (4.3 - 8.2 ft)
1.16 : 1 fixed lens 1.4 - 6.2 m (4.6 - 20.3 ft)
1.45 - 1.74 : 1 zoom lens 1.8 - 9.3 m (5.9 - 30.5 ft)
1.74 - 2.17 : 1 zoom lens 2.2 - 11.8 m (7.2 - 38.7 ft)
2.17 - 2.90 : 1 zoom lens 2.7 - 15.4 m (8.9 - 50.5 ft)
2.90 - 4.34 : 1 zoom lens 3.6 - 22.5 m (11.8 - 73.8 ft)
4.34 - 6.76 : 1 zoom lens 5.5 - 35 m (18 - 115 ft)
DMD™ aspect ratio
Source aspect ratio
TRC =
Throw distance
Screen width x TRC
Throw ratio =