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Preparations
Projection Distance and Size
Use the figures, tables, and formulas below to determine the projection size and projection
distance. (Projection sizes are approximate values for full-size picture with no keystone
adjustment.)
Screen
As seen from above
As seen from the side
a is the distance (m) between the lens and the screen, and corresponds to a range of
1.36 m to 11 m. H is the height from the image bottom to the center of the lens.
90
a
90
H
Lens center
a (min length) =
projection size (inches)
25.3807
a (max length) =
projection size (inches)
23.0947
projection
size
(inches)
projection distance a (m)
height
(H)
(cm)
min length
(zooming
max)
max length
(zooming
min)
34.67 1.36 1.50 7.9
40 1.57 1.73 9.1
60 2.36 2.60 13.7
80 3.15 3.46 18.3
100 3.94 4.33 22.9
150 5.90 6.49 34.3
200 7.87 8.65 45.7
250 9.84 10.82 57.2
254.22 10 11 58.1