22

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 (cm, feet) between the lens and the screen, and corresponds to a range of

1 m to 11.88m (3.28 ft. to 38.97 ft.). H is the height (cm, feet) from the image bottom to the

center of the lens.

90
a
90
H
Lens center
projection
size
(inches)
Wide Tele Offset
distance distance height (H)
(m) (feet) (m) (feet) (cm) (feet)
23.9 --- --- 1.00 3.28 5.5 0.18
30 1.15 3.77 1.28 4.19 6.9 0.23
40 1.56 5.10 1.73 5.66 9.1 0.30
60 2.37 7.77 2.62 8.60 13.7 0.45
80 3.18 10.43 3.52 11.53 18.3 0.60
100 3.98 13.07 4.41 14.46 22.9 0.75
150 5.99 19.64 6.62 21.72 34.3 1.13
200 7.97 26.15 8.82 28.93 45.7 1.50
250 9.93 32.59 10.99 36.07 57.2 1.88
300 11.88 38.97 --- --- 68.6 2.25
Placement(Continued)
minlength
 a(cm)=-0.000381xprojectionsize(inches)2 + 4.1 x projection size (inches) - 7.8
 a(feet)=-0.0000125xprojectionsize(inches)2 + 0.135 x projection size (inches) - 0.256
maxlength
 a(cm)=-0.000365xprojectionsize(inches)2 + 4.52 x projection size (inches) - 7.7
 a(feet)=-0.000012xprojectionsize(inches)2 + 0.148 x projection size (inches) - 0.253
height
 H(cm)=projectionsize(inches)x0.2286
 H(feet)=projectionsize(inches)x0.0075