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Digital Projection E-Vision Laser 15000 Series
Appendix B: Choosing a lens
A number of lenses are available. Which lens you choose depends on the screen size, image aspect ratio, throw distance and light output.
The following table shows all available lenses in order of their throw ratios:
Throw Ratio Focus Range
0.377 : 1 fixed (UST) 0.82 m - 2.71 m
0.75 - 0.93 : 1 zoom 1.02 m - 12.7 m
0.76 : 1 fixed
0.81 m - 5.08 m
1.25 - 1.79 : 1 zoom 1.33 m - 11.73 m
1.73 - 2.27 : 1 zoom 1.83 m - 14.9 m
2.22 - 3.67 : 1 zoom 2.36 m - 24.2 m
3.58 - 5.38 : 1 zoom 3.8 m - 35.35 m
5.31 - 8.26 : 1 zoom 5.59 m - 54.8 m
To choose a lens, calculate the throw ratio required. Allow a tolerance of +/- 3% in the throw ratio calculation.
Rev B April 2021
page 112
Lens Shift
Depends on image size, see UST Lens Installation Guide (separate document) 117-341
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
none
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
V: 0.5 (U) 0.3 (D) frame
H: 0.1 (L) 0.2 (R) frame
Appendix B: Choosing a lens
Part Number
115-339
112-499
112-500
112-501
112-502
112-503
112-504
Notes
Throw distance calculations are
based on the distance from the
outer end of the lens, which varies
from lens to lens.
The lens extension is the distance
between the front of the projector
chassis and the outer end of the
lens when it is fully extended.
Refer to the projector CAD
drawings for individual lens
extension figures.
The 0.377 : 1 fixed lens has no
adjustable shift value. However,
the lens has an inherent offset
depending on image size. See the
UST documentation published
separately on the Digital Projection
website.
The 0.75 - 0.93 : 1 zoom lens
has a feature that permits focus
correction for curved screens. The
front ring of the lens is a manual
control that provides focus
curvature adjustment to correct for
the different focal distances
between center and corner.
See Fitting a lens hood on page 23
for more information about using
the right lens and hood
Reference Guide
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