Movie Makers (Jan-Dec 1949)
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373
Screen
Angle
A
to Side of
Protection Axis
.2 <
4
L w
a o
EL.
^^/ 30c I
/ 20° /
Relative
4°
40° y^. /
Brightness
of Different
* >0
/
Type Screens
so
220 320 « Beaded-Surface
100 « Malte-Surface
Lens Len
Focal gth
Distance in Feet From Screen
8' | 10'
12'
16' | 20'
25' | 32' 36' | 40' 50' 1 64' j 75' | 100' j 125' | 150'
On 8mm. Projector
16mm, Projector
Width of Picture
Vs"
4'10"
6'0"
7'2"
97"
12'0"
H"
4'0"
5'0"
6'0"
8'0"
lO'O"
12'6"
l"
3'0"
3'9*
2'6"
4'6"
6'0"
7'6"
9'4"
ll'll*
13'5"
14 '11"
%"
n-i"
2'0"
3'0"
4'0*
5'0"
6 '3"
8'0"
9'0"
lO'O"
12'6"
1"
2"
IV
110 *
2'3"
3'0*
3'9'
4'8"
6 0"
6'9"
7'5"
9'4"
ll'll"
140 "
18-9"
23'5"
28'1"
2Yi"
1'2"
1'6"
1'9'
2'4"
3'0"
3'9"
4'9"
5'4* 4'6"
6'0"
7'6"
9'7"
11'3'
15'0"
19'8"
22'5"
Wi'
3"
1'3"
1'6"
2'0'
2'6"
3'1"
4'0"
5'0"
6'3"
S'O"
9'4"
12'6"
15'7' 13'4"
18'8"
3M"
l'O"
1'3"
1'8'
2'1"
2'8"
3'5'
3'10'
4'3"
5'4"
6'11"
8'0"
10'8"
16'0.
4* •
l'l"
1'6"
110*
o'4'
3'0'
3'3"
3'9"
4'8"
6'0° 1 7'0*
9'4"
11'8"
14'0'
FIG. 1: Relative brightness and diffusion qualities of beaded and matte screen surfaces are seen above.
a hall) make it possible to seat members of the audience within the twenty degree area mentioned, the beaded screen will be the more reflective. If, on the other hand, people must be seated outside of that area, the matte surface screen is indicated. (In connection with this ratio between relative brightness and diffusion, the silvered surface may be classed as having higher relative brightness than the matte but lower than the beaded. Therefore, it will fall off in brightness less swiftly than the beaded surface but slightly more swiftly than the matte screen.)
HOW BIG IS ENOUGH? Having decided on the type of screen surface that will serve him best, the amateur filmer's next projection problem is probably that of screen size. "How big a screen should I get?" he generally asks. Although there are no exact answers to this question, it might
be better to begin with if the question read, "How small a screen should I get?"
For the tendency over the years among home projectionists has been to push up screen size beyond the point where it serves any purpose — often, even, to a size that is a genuine disservice. Largely, we believe, this expanding screen size came about simply because it could be done. The amazing brightness of the beaded screen and the almost universal equipment of home projectors with the fast //1.6 lens and a projection lamp of 500 watts or more made quite possible an adequate image brilliance at screen sizes previously undreamed of. And so, for a time, screen areas expanded. It remains true, however, that your projection screen — especially in the home — can be too big. Let's see what standards there are to guide us.
DISTANCE AND SCREEN SIZE
Perhaps the most usual determining factor of screen size
i> the thoroughly practical one — how big is your room?
In other words, what is the maximum distance that you
can arrange between your pro [Continued on page 386]
Table courtesy Bell & Howell Co.
FIG. 2: The size of your projected picture is determined by projector-to-screen distance and the focal length of lens used. Screen areas covered by standard 1 and 2 inch lenses are set in heavy type.
At This
Lens-lo-Screen
Distance
For
Tins Size
Picture
Use This
Projection
Lens
Use This Lamp With a Matte White Screen
Use This Lamp
With a Beaded Screen
Use This Lamp
With an
Aluminum Screen
10 feet 10 feet 10 feet
34" x 45" 22" x 30" 16i"x22"
1" //2.5 14* //2.5 2" //2.S
500-watt 400-watt
750-watt 400-watt
+
400-watt
+ +
15 feet , 15 feet 15 feet
34" x 45" 26" x 34" 26" x 34"
H" //2.S 2" //2.5 2" f/1.6
750-watt 500-watt
750-watt 400-watt
+
500-watt +
+
20 feet 20 feet 20 feet 20 feet
45" x 60" 34" X 45" 34"x45" 22" X 30"
H" //2.S 2" //2.5
2" y/i.6
3" //2
750-watt 500-watt
750-watt
400-watt
+
750-watt 400-watt
+ +
25 feet 25 feet 25 feet
42" x 56" 42" x 56" 29" x 38"
2" //2.5 2" //1.6 3" //2
750-watt
750-watt 400-watt
500-watt 400-watt
+
30 feet 30 feet 30 feet
51" x 68" 34" x 45" 26" x 34"
2" //1.6 3" //2 4" //2.5
750-watt 750-watt
750-watt 500-watt 400-watt
500-watt
+ +
35 feet 35 feet 35 feet
60" x 80" 40" x 53" 30" x 40"
2" //1.6 3" //2 4" //2.5
750-watt 500-watt
750-watt 400-watt
+
40 feet 40 feet 40 feet
68" x 90" 45" X 60" 34" x 45"
2" //1.6 3" //2 4" //2.5
750-watt 750-watt
750-watt 500-watt 400-watt
45 feet 45 feet
51" x 68" 38" x 51"
3" //2 4" //2.S
750-watt
500-watt 400-watt
50 feet 60 feet
42" x 56" 51"x68"
4" //2.5 4" //2.5
=
500-watt 750-watt
FIG. 3: Recommended combinations of lenses, projection lamps and screen surfaces for various picture areas are tabled above. Accessory lens speeds are growing faster and a wide angle lens is added for 8's.
FIG. 4 from screen
Desirable seating areas are determined by angle of view and distance the latter case, from three to six times the width of screen.