International projectionist (Jan 1959-Dec 1960)
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PROJECTION DISTANCE IN FEET
FOCAL LENGTH OF PROJECTOR LENS (INCHES)
3A
1
1*
2
2i
3
3i
»t
10
70"x52"
50"x37"
l)O"x30"
|
|
15
9if»x70"
72"x$¥'<
50"x37"
It0"x30"
^"xSO"
20
12'x 9'
9h"x70"
70"x52"
50"x37"
itO"x30"
ifO^O"
i»O"x30"
25
Il*'x11'
10'x 8'
8V'x63"
6o"xif5"
50"x37"
i*0"x30"
ItO'^O"
to^o"
30
16'x12'
12'x 9'
9if»x70"
72"x5V'
60"x^5"
50"x37"
»K)"x30"
iK>"x30"
35
ho
1if'x11' 16'x12'
9'x 7'
12IX gi
8^"x63"
70"x52" 8^"x63"
60"x^5" 70"x52"
50"x37" 60"xh5"
50"x37" 50"x37"
h5
12'x 9'
9'x 71
8VX63"
72"x5V"
70"x52"
60"x^5"
50
1^'xH'
10'x 8'
9Vx70"
8V'x63"
70"x52''
60"x4-5"
60
16'x12'
12'x 9*
10'x 81
9h"x70"
81t"x63»
72"x5V«
70
1^x11 •
12'x 91
9'x 7'
91<-"x70"
8V'x63"
80
16'x12'
lVx11*
12'x 9*
9'x 7'
9V'x70»
90
lVx11'
12'x 9'
10'x 8'
9'x 7'
100
16'x12'
A 7
TABLE IV: Recommended screen sizes for 16-mm projection (Screens slightly oversize to provide margin around projected picture)
about */4 the center-line brightness. Beaded screens are employed primarily to give pictures larger and brighter than are possible on matte screens with low-power projectors, but they restrict the maximum viewing angle
FIG. 5. The best viewing area for pearlescent screens. These screens are only mildly directional, increasing picture brightness over a moderately wide area. Pearlescent screens provid; the sharp, finely delineated images characteristic of matte screens, and they are very nearly as versatile, serving all V-A needs.
to within 15 degrees of the center line (Fig. 4).
Obviously. beaded screens are suited only to very narrow seating areas quite unlike those in conventional classrooms and auditoriums. Moreover, the beaded surface has a tendency to "fog" the finer pictorial de
tail of the projected pictures. Beaded screens have nearly the same integrated, or overall, reflectance as matte screens, but aluminum screens, another directional type, reflect only about 70% of the total light. Aside from their grainy, mottled appearance when not perfectly flat, aluminum screens also look too dim at extreme viewing angles.
Some of the advantages of the high
brightness directional screen are found in a new type of matte screen surfaced with "essence of pearl." The new pearlescent screens have a center-line reflectivity of more than 160% with a falloff to about 100% at 25 degrees, and 80% at 30 degrees.
As indicated by Fig. 5, the seating area may include viewing angles up to 30 degrees when pearlescent screens are used. The pictures will appear somewhat brighter than those on plain matte screens over a reasonably wide area, and they will be just as clear and free from grain and fog.
Oblique Projection Angles Tabu
No matter which type or size of screen is used, it should face the middle of the viewing area squarely, and the axis of the projected light-beam should intersect its center as nearly perpendicularly as possible. Oblique projection angles produce grotesquely distorted pictures, as is evidenced in theatres where excessive downward projection angles make the actors appear abnormally tall and thin.
Only with the right type of screen of the most suitable size, and properly located in relation to audience and projector, can the truly marvelous teaching power of the motion picture, the slidefilm, and the lantern slide best aid the teacher in her art of training and instructing.
Qh When is a mistake a blunder?
a # When a projectionist is not a regular subscriber ^* to IP — MUST reading for the projectionist craft.
USE THE HANDY ORDER FORM BELOW
INTERNATIONAL PROJECTIONIST 19 West 44 St., New York 36, N. Y.
. . , D 1 year (12) issues— $3.00 Enter my subscription for n 2 yeQrs (24) issues_$5.00
FOREIGN: Add $1.00 per year
Name
Address
City Zone State
26
INTERNATIONAL PROJECTIONIST • FEBRUARY 1959