Choosing A Lens - Digital Projection E-Vision Laser WQ120 Series Installation And Quick Start Manual

Digital Projection E-Vision Laser WQ120 Series

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 ratios Focus range
0.79 - 0.99 : 1 zoom 1.02 m - 12.7 m
1.32 - 1.89 : 1 zoom 1.33 m - 11.73 m
1.82 - 2.40 : 1 zoom 1.83 m - 14.9 m
2.34 - 3.90 : 1 zoom 2.36 m - 24.2 m
To choose a lens, calculate the throw ratio required.

CHOOSING A LENS

Lens shift
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
Notes
Throw distance calculations are
based on the distance from the outer
end of the lens, which will vary from
lens to lens.
The distance between the front
of the projector chassis and the
outer end of the lens is called lens
extension. Lens extensions are
measured when the lens is focused
at infinity, and fully extended.
Refer to the projector CAD drawings
for individual lens extension figures.
The 0.79 - 0.99 : 1 zoom lens has
an additional feature permitting
focus correction for curved screens.
The front ring of the lens is a
manual control which provides focus
curvature adjustment to correct for
the different focal distances between
center and corner.
For information about individual lens
part numbers, see Appendix A at
the end of this document.
Rev A May 2018
page 69