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ELECTRICAL PRODUCTS RESEARCH
DEVELOPMENT COMPANY
“The Voice of the Drive-In”
1207 CHERRY STREET • TOLEDO 4. OHIO
Let’s
Play
Ball
Toss your worries to the wind and come and play ball with me. Wet, dry, hot or cold — whatever the weather — I'm always ready to perform beautifully.
You'll also find I'm very easy on your pocketbook. Besides costing very little to start with, my upkeep is practically nil.
I've been told I'm the prettiest, but I'm especially proud of my voice. But don't take my word for it! Ask the man who owns some EPRAD in-the-car speakers. See your favorite independent supply dealer.
BODDE SCREEN CO.
Price Reductions
Now Priced and manufactured to Sell for
7
19
SQ. FT.
Effective Feb. Ut, 1956
BODDE SCREEN CO.
11541 Bradley Ave. • San Fernando, CaliT.
SAME! Heavy Duty Screen
SAME! Famous & Guaranteed Qualities
SAME! Custom made & scientifically engineered surfaces
6 Aluminized Reflective Surfaces
3 White Matte Reflective Surfaces
zontal plane and in this plane they acted exactly like the elements of the telescope. In the vertical plane, however, the surfaces of the elements were all parallel to one another and therefore had no action on the rays of light in that direction.
The shape of the lenses in Figure 2 are rectangular, but in the actual equipment the corners are ground off so that they will
t—
1
1
1
^ 1
Z
f’
1
1
1
TO 1
PROJECTION 1 LENS '
1
A
1 ^0 1 SCREEN 1 1
1
SIMPLE CYLINDRICAL ANAMORPHIC LENS
FIGURE 2 — Relations of elements in anamorphic lens to projection lens and screen.
fit the round barrel shape with which we are familiar. The glass elements in the actual anamorphic device are more complicated than shown in the sketch. Each of the two combinations comprises several glass elements to provide the necessary color and linear corrections.
All elements must be of the highest optical accuracy in order to guard against the introduction of undesired distortions. However, the attachment will not correct any defects that may be already existing in the projection lenses. It is important that the projection, or “back-up,” lens be of the best quality and have maximum resolution, because the greater magnification produced by the CinemaScope attachment in the horizontal direction will tend to show up any defects existing in the backing lens.
THE ANAMORPHIC SYSTEM
The cylindrical anamorphic attachment can be used with any focal length of projection lens so long as the two units have the proper connecting fittings. The rear element of the anamorphic attachment should be as close to the front element of the projection lens as conveniently possible. This is to make sure that the outside light rays from the lens all enter the first element of the anamorphic attachment and prevent light loss and vignetting for the corners and sides of the picture on the screen.
When high-speed, long-focus projection lenses are used, it becomes necessary to install an attachment with larger glass elements. Such anamorphic devices have been manufactured by the lens companies and have given good service.
Although the cylindrical anamorphic attachment will operate with lenses of all focal lengths, careful adjustment must be made to the anamorphic lens itself in order to set it for a given projection throw in the theatre.
16
MOTION PICTURE HERALD, MARCH 3, 1956