Draper Luma 207121 ユーザーズマニュアル

How to Calculate a Custom Size

Draper manufactures custom size screens to meet your specification . Virtually any size within the maximum shown for a given model is 
available . If you need to calculate a custom size, the following formulas may be useful (D = exact diagonal; H = viewing area height; W = viewing 
area width) .

H = D x  .6

H = D x  .49

H = D x  .4762

H = D x  .3915

H = D x  .5146

H = D x  .5299

W= D x  .8

W = D x  .87146

W = D x  .881

W = D x  .92

W = D x  .8576

W = D x  .848

D= H x 1 .667

D = H x 2 .04

D = H x 2 .1

D = H x 2 .554

D = H x 1 .9433

D = H x 1 .8868

D = W x 1 .25

D = W x 1 .1475

D = W x 1 .135

D = W x 1 .0868

D = W x 1 .166

D = W x 1 .1793

1:1

Overhead and opaque projection

15:9

Native computer format

4:3

NTSC video and most data-graphics

16:9

High Definition Television (HDTV)

3:2

2x2 standard slides (35mm DF)

1 .85:1

WideScreen (also known as Letterbox and Panavision)

16:10

Native computer format

2 .35:1

CinemaScope

Note: Vertical presentation of a slide reverses its aspect ratio . To allow this, use a 1:1 aspect ratio for any type slide .

Screen Size Selection

Projection Formats

One of the most important decisions in screen selection is 
to determine the correct size of screen based upon:

1 . The dimensions of the audience area . 
2 . The projection format(s) to be used .

In some situations, these two questions yield the same 
answer; in others they do not and compromises must 
be made . Here are the key considerations:

• Audience Area—In determining the correct screen size in relation 

to the audience area, the goal is to make the screen large enough so 
those in the rear of the audience area can read the subject matter 
easily, but not so large that those in the front of the audience area 
have difficulty seeing the full width of the projected image .

• Height—Use the following formulas for calculating screen height 

for maximum legibility . For 4:3 moving video and entertainment, 
screen height should be at least 1/6 the distance from the screen to 
the furthest seat; for charts and data, as in a conference or lecture 
room, use 1/4; for complex graphics, as in a command/control center, 
use 1/2 . For 16:9, 1 .85:1, or 2 .35:1 projection, screen height should equal 
or exceed 1/3 the distance from the screen to the optimum seat .

• Width—Screen width is generally determined by the height 

of the screen and the projection formats to be used .

• Ceiling Height—The bottom of the screen should be 

approximately 40–48" above the floor in a room with a level 
floor and several rows of seats . In rooms with theatre seating 
or only one or two rows, such as a home theatre, the bottom 
of the screen should usually be 24–36" above the floor . Try to 
make sure that the lower part of the screen will be visible from 
all seats . Extra drop may be required to position the screen at 
a comfortable viewing level in a room with a high ceiling .

• Projection Format—Once you have determined the correct size of 

screen for the audience area, that size may be modified based 
upon the type(s) of projection equipment to be used . If the 
screen will only be used with one type of projector (NTSC video, 
HDTV, etc .), it is easy to determine exact screen dimensions 
based upon the projection format of that projector . Projection 
formats are expressed in terms of aspect ratio, which is the 
relationship of the height of the projected image to its width . 
Aspect ratios of common projection formats are listed below .

Most models of Draper screens are offered in both audio visual 
and 4:3 NTSC video formats . Many models are also offered in HDTV, 
WideScreen, and CinemaScope formats . Now, Draper also offers 
many screens in new 16:10 and 15:9 aspect ratios, commonly used 
for projecting native laptop computer displays . 16:10 sizes are 
now featured in this price list; 15:9 sizes are published in the Excel 
electronic versions of this document . Download these by visiting:

We provide almost any Draper screen in the size and projection 
format of your choice . We can provide any size up to and including 
the largest published size . 

Audiovisual (or AV) format screens are intended for general use . They 
accommodate a variety of projector types and range from square 
to wide horizontal in aspect ratio . AV format screens are described 
in terms of height x width and are standard without black borders, 

although borders are optionally available . Screens with Draper's Tab 
Tensioning System always include black borders and 12" black drop at 
the top .

NTSC format screens are specifically designed for use with 
projectors . The NTSC format is strictly defined as a 4:3 rectangle (4 
wide by 3 high), and the size is usually described in terms of a nominal 
diagonal . Conventional models of video format screens are furnished 
with black borders to frame the image on all four sides, allowing for 
projector overscan . Draper's standard is to furnish Tab-Tensioned 
electric screens with black borders at the sides and bottom and 12" 
of black drop at the top . HDTV format (16 wide by 9 high) is also 
available for high-definition television projection, and WideScreen 
format (1 .85:1) is offered for letterboxed video images . The ultimate 
in home theater, CinemaScope format (2 .35:1) allows projection of 
movies in their full native width without letterboxing . Other formats 
are available by quotation .