Calculating screen width and throw distance
Throw Distance =
Screen Width x Lens Throw Ratio
Screen Width
=
Throw Distance
Lens Throw Ratio
The following lenses are available.
Throw Ratio
Focus range
Fixed lens
0.77:1
1.3 - 2.45m
Fixed lens
1.16:1
1.4 - 6.2m
Zoom lens
1.45–1.74:1 zoom
1.8 - 9.3m
Zoom lens
1.74–2.17:1 zoom
2.2 - 11.8m (standard lens)
Zoom lens
2.17–2.90:1 zoom
2.7 - 15.4m
Zoom lens
2.90 - 4.34:1 zoom
3.6 - 22.5m
Zoom lens
4.34–6.76:1 zoom
5.5 - 35m
These throw ratios are correct for images that fill the full width of the DMD. For
images that do not fill the full width, the throw ratio will be larger. For 4:3 images,
the throw ratio is increased by a factor of 1.33. The effect of this can be seen on
the lens charts on the following pages.
Rev A October 2010
Page 2.3
Digital Projection
HIGHlite 6000
User Manual
2. Installation
Screen size vs throw distance
Throw distance is the distance measured from the front of the projector to the
screen. This is an important calculation in any projector installation as it determines
whether or not you have enough room to install your projector with the desired
screen size, and if your image will be the right size for your screen.
Notes
Do not confuse the focus range
with the zoom range:
The focus range is the distanc
e over which the image can be
focused .
The zoom range is the range
over which the throw ratio can
be changed using the zoom
control.
