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Projection
Distance
and
Image
Size
The following
table indicates the
width of
a square
screen
necessary for various
projection
distances and
focal
lengths
of
projection
lenses.
Focal
Length
I
Projection
Distances
and Screen
Image
Sizes for 24
x
36 mm Frame (in
feet)
of
Lens
10
ft.
I
13
ft.
I
16
ft.
I
20
ft.
I
23 ft.
I
26
ft.
90 mm
(3'12")
2'6" x 3'9"
3'3"
x 5'0"
4'0" x 6'2"
5'1"x7'8"
i
5'10"x8'11"
I
67" x 10'0"
100
mm (4")
2'3"
x
3'5"
2'9"
x
4'6"
3'8"
x
5'6"
4'6"
x
6'11"
15'3" x 7'11"
5'11"
x
9'
120
mm
(5")
2'5
x
3'8"
3'x47"
3'9"x5'9"
4'4"x67"
I
4'11"
x
7'6"
I
Projection
Distances
and Screen
Image
Sizes for 24
x
36 mm
Frame
(in
feet)
30
ft.
I
33
ft.
I
36
ft.
I
40
ft.
43
ft.
90 mm
(3'1>")
177"
x
117"
I
100 mm
(4")
6'10"
x
10'4"
7'6"x11
'6"
8'2"x12'6"
I
120 mm
(5")
I
5'8" x 8'8"
6'3"x9'6"
6'10"x10'4"
77"x117"
8'2"x12'6"
This table
applies
to 24x36mm
miniature
transparencies.
With
l'hx1'h
inch
(38x38mm)
superslides
the
screen
image
is approximately
10
per cent
larger
at the same
projection
distance.
For larger
projection
distances
and screen
image
sizes please
ask for further
details.
18
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