Vivitek D8300 Series Projector User Manual


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Page 2.7
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.
Calculating screen width and throw distance
Throw Distance = Screen Width x Lens Throw Ratio
Screen Width = Throw Distance
Lens Throw Ratio
7KUHHPRGHOVRIWKHSURMHFWRUDUHDYDLODEOH¿WWHGZLWKWKHIROORZLQJOHQVHV
Throw Ratio Focus range
Fixed lens  WREHFRQ¿UPHG
Short-throw lens ±]RRP ±PIW
Long-throw lens ±]RRP ±PIW
Two optional converter lenses are available, which modify the throw ratios as shown
EHORZ
0.8x converter 1.25x converter
Short-throw lens ± ±
Long-throw lens ± ±
7KHVHWKURZUDWLRVDUHFRUUHFWIRULPDJHVWKDW¿OOWKHIXOOZLGWKRIWKH'0')RU
LPDJHVWKDWGRQRW¿OOWKHIXOOZLGWKWKHWKURZUDWLRZLOOEHODUJHU)RULPDJHV
WKHWKURZUDWLRLVLQFUHDVHGE\DIDFWRURI The effect of this can be seen on the
lens charts on the following pages.
Ɣ
Ɣ
Ɣ
Ɣ
Ɣ
Notes
For more information about the
relationship between screen
size, throw distance and
converter lenses, see the Lens
charts on the following pages.
Do not confuse the focus range
with the zoom range:
- the focus range is the distance
over which the image can be
focused using the focus ring.
- the zoom range is the range
over which the throw ratio can
be changed using the zoom
ring.
The converter lens is not
physically compatible with the
Fixed lens.
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