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• 

Place a translucent screen between the projector and the audience.

• 

Reverse the image by setting “Rear” in “PRJ Mode”.

• 

Place a mirror (normal flat type) in front of the lens.

When using a mirror, be sure to carefully position both the projector and the mirror so the light does not
shine into the eyes of the audience.

• 

It is recommended that you use the optional Sharp ceiling mount bracket for this
installation. Before mounting the projector, contact your nearest Sharp Authorised
Projector Dealer or Service Centre to obtain the recommended ceiling-mount bracket
(sold separately.) AN-60KT ceiling-mount bracket, its AN-TK201 and ANTK202
extension tubes (for countries other than the U.S.A. and GERMANY).

• 

Be sure to adjust the position of the projector to match the distance (H) from the lens
centre position to the lower edge of the image, when mounting the projector on the
ceiling.

• 

Invert the image by setting “Ceiling + Front” in “PRJ Mode”. 

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Picture (Screen) size

Projection distance (L)

Diag. (X)

Width

Height

Maximum (L1)

Minimum (L2)

Distance from the

lens centre to the

bottom of the image

(H)

200”

4.43m

2.49m

7.1m

8.2m

-64cm

150”

3.32m

1.87m

5.3m

6.1m

-48cm

100”

2.21m

1.25m

3.5m

4.1m

-32cm

80”

1.77m

1.00m

2.8m

3.3m

-26cm

70”

1.55m

0.87m

2.5m

2.9m

-23cm

60”

1.33m

0.75m

2.1m

2.5m

-19cm

40”

0.89m

0.50m

1.4m

1.6m

-13cm

The formula for picture size and projection distance
L1 (m) = 0.03541χ / 0.03048
L2 (m) = 0.04098χ / 0.03048
H (cm) = 0.032249 χ / 2.54
X: Picture size (diag.) (in)
L: Projection distance (m)
L1: Maximum projection distance (ft)
L2: Minimum projection distance (ft)
H: Distance from the lens centre to the bottom of the image (in)

Picture (Screen) size

Projection distance (L)

Diag. (X)

Width

Height

Maximum (L1)

Minimum (L2)

Distance from the

lens centre to the

bottom of the image

(H)

200”

4.06m

3.05m

8.7m

10.0m

-79cm

150”

3.05m

2.29m

6.5m

7.5m

-59cm

100”

2.03m

1.52m

4.3m

5.0m

-39cm

80”

1.63m

1.22m

3.5m

4.0m

-32cm

70”

1.42m

1.07m

3.0m

3.5m

-28cm

60”

1.22m

0.91m

2.6m

3.0m

-24cm

40”

0.81m

0.61m

1.7m

2.0m

-16cm

The formula for picture size and projection distance
L1 (m) = 0.02452χ / 0.05334
L2 (m) = 0.03671χ / 0.05215
H (cm) = –0.03810χ

Note

• 

There is an error of ± 3% in the formula above.

• 

Values with a minus (–) sign indicate the distance of the lens centre below the bottom of the image.

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Positioning a projector is not just a simple case of installing the correct bracket to the ceiling
and hoping for the best. The type of lens that the projector has will affect how big the image
can be. The two most important considerations, in selecting the type of lens your projector
should have, are the desired image size and desired or available throw distance. These two
measurements can be used to calculate the lens ‘Throw Ratio’ that is needed. This is the
throw distance to screen width ratio.

All three measurements are directly related so knowing the throw ratio and desired screen
size, it is easy to determine the throw distance.

The simple calculation triangle below can be used:

So 

D=W x R

W=D ÷ R

R=D ÷ W

Example  A projector has a lens whose throw ratio is 0.9:1, the required screen width is
2m what is the throw distance?

D=W x R 

D = 2 x 0.9 = 1.8m

In order to give more flexibility, most projectors have a zoom control. This allows the image to
be adjusted for size without moving the projector. The figures given here indicate that by
using the zoom control, throw ratios of 1.5:1 through to 1.9:1 can be achieved. 
The amount of zoom available is specified as a multiplier.
A quoted zoom value of 1-1.3x means that the image can be enlarged by up to 30% with the
zoom control.

D

Screen sizes are usually measured diagonally. As the throw ratio is determined from the
throw distance and screen width, the diagonal measurement should not be used in the
calculation.

20

Consider the following triangle in relation to your screen

The most common image format for CTV, PC and projected images is 4:3 (4 by 3). This is
also known as the image aspect ratio. This means that the height measurement is ¾ that of
the width. Using the 3-4-5 triangle rule, the diagonal measurement can be used to calculated
width.

Examples 

Diagonal = 10m Width = (Diagonal ÷ 5) x 4  = 10 ÷ 5 x 4 = 8m
Height = 6m   Width = (Height ÷ 3) x 4  = 6 ÷ 3 x 4 = 8m

Although 4:3 is a popular aspect ratio there are others:

5:4
Some PCs are able to produce SXGA images, which offer a resolution of 1280 dots
horizontally by 1024 dots vertically. This aspect ratio is 5:4 

16:9 and 21:9
The majority of DVD format films are now mastered in Wide-Screen format, of which there are
two popular aspect ratios; 16:9 and 21:9. Sometimes these ratios are quantified with respect
to 1, so expect to see 1.85:1 and 2.35:1 respectively.

Knowing the diagonal measurement, calculating the screen width with these other ratios can
be done in a similar manner.

For 5:4 (1.25:1) Width = (Diagonal ÷ 6.403) x 5
For 16:9 (1.78:1)

Width = (Diagonal ÷ 18.358) x 16

For 21:9 (2.35:1)

Width = (Diagonal ÷ 22.847) x 21

 

Focal Length
This is the distance between the display panel and the focal point. The focal length is usually
printed on the lens ring and is usually preceded with a lower case f. If it is a zoom lens then
two figures will be present, one each for the maximum and minimum zoom. eg. f=32.5-44mm.
This figure can be used to calculate the image size and throw distance values if the size of
the display panel is known.