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17

• 

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-PGCM90 ceiling-mount bracket, its AN-EP101B extension tube and
AN-JT200 universal bracket, adapter for non-level ceiling installation (for U.S.A.). BB-
A10T ceiling adapter, its BB-NVHOLDER280, BBNVHOLDER550, BB-NVHOLDER900
ceiling mount systems (for GERMANY). 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”. 

18

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)

300" (762 cm)

240" (609.6cm)

180"(457.2 cm)

–

50' 6" (15.4 m)

–25 28/64" (–64.6 cm)

250" (635 cm)

200" (508 cm)

150" (381 cm)

50' 10" (15.5 m)

42' 1" (12.8 m)

–21 13/64" (–53.8 cm)

200" (508 cm)

160" (406.4 cm)

120" (304.8 cm)

40' 7" (12.4 m)

33' 8" (10.3 m)

–16 61/64" (–43.1 cm)

150" (381 cm)

120" (304.8 cm)

90" (228.6 cm)

30' 5" (9.3 m)

25' 2" (7.7 m)

–12 46/64" (–32.3 cm)

100" (254 cm)

80" (203.2 cm)

60" (152.4 cm)

20' 3" (6.2 m)

16' 9" (5.1 m)

–8 31/64" (–21.5 cm)

84" (213.3 cm)

67" (170.1 cm)

50" (127 cm)

17' 0" (5.2 m)

14' 1" (4.3 m)

–7 8/64" (–18.1 cm)

72" (182.8 cm)

58" (147.3 cm)

43" (109.2 cm)

14' 6" (4.4 m)

12' 0" (3.7 m)

–6 7/64" (–15.5 cm)

60" (152.4 cm)

48" (121.9 cm)

36" (91.4 cm)

12' 1" (3.7 m)

10' 0" (3.0 m)

–5 6/64" (–12.9 cm)

40" (101.6 cm)

32" (81.2 cm)

24" (60.9 cm)

8' 0" (2.4 m)

6' 8" (2.0 m)

–3 25/64" (–8.6 cm)

The formula for picture size and projection distance
L1 (ft)
= (0.062081X – 0.038676) / 0.3048
L2 (ft)
= (0.051456X – 0.038901) / 0.3048
H (in) = – 0.0848X
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)

250" (635 cm)

218" (553.7 cm)

123" (312.4 cm)

–

45'10" (14.0 m)

-43 34/64" (–110.6 cm)

225" (571.5 cm)

196" (497.8 cm)

110" (279.4 cm)

49' 10" (15.2 m)

41' 3" (12.6 m)

-39 11/64" (–99.5 cm)

200" (508 cm)

174" (441.9 cm)

98" (248.9 cm)

44' 3" (13.5 m)

36' 8" (11.2 m)

-34 52/64" (–88.4 cm)

150" (381 cm)

131" (332.7 cm)

74" (188 cm)

33' 2" (10.1 m)

27' 6" (8.4 m)

-26 7/64" (–66.3 cm)

133" (337.8 cm)

116" (294.6 cm)

65" (165.1 cm)

29' 5" (9.0 m)

24' 4" (7.4 m)

-23 10/64" (–58.8 cm)

106" (269.2 cm)

92" (233.6 cm)

52" (132 cm)

23' 5" (7.1 m)

19' 4" (5.9 m)

-18 29/64" (–46.9 cm)

100" (254 cm)

87" (220.9 cm)

49" (124.4 cm)

22' 1" (6.7 m)

18' 3" (5.6 m)

-17 26/64" (–44.2 cm)

92" (233.6 cm)

80" (203.2 cm)

45" (114.3 cm)

20' 3" (6.2 m)

16' 10"(5.1 m)

-16 1/64" (–40.7 cm)

84" (213.3 cm)

73" (185.4 cm)

41" (104.1 cm)

18' 6" (5.6 m)

15' 4" (4.7 m)

-14 40/64" (–37.1 cm)

72" (182.8 cm)

63" (160 cm)

35" (88.9 cm)

15' 10" (4.8 m)

13' 1" (4.0 m)

-12 34/64" (–31.8 cm)

60" (152.4 cm)

52" (132 cm)

29" (73.6 cm)

13' 2" (4.0 m)

10' 11"(3.3 m)

-10 29/64" (–26.5 cm)

40" (101.6 cm)

35" (88.9 cm)

20" (50.8 cm)

8' 9" (2.7 m)

7' 3" (2.2 m)

-6 62/64" (–17.7 cm)

The formula for picture size and projection distance
L1 (ft)
= (0.067635X – 0.038676) / 0.3048
L2 (ft)
= (0.056060X – 0.038901) / 0.3048
H (in) = – 0.1741X

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.

19

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)

300" (762 cm)

240" (609.6cm)

180"(457.2 cm)

–

39' 5" (12.0 m)

0" (0.0 cm)

250" (635 cm)

200" (508 cm)

150" (381 cm)

39' 8" (12.1 m)

32' 10"(10.0 m)

0" (0.0 cm)

200" (508 cm)

160" (406.4 cm)

120" (304.8 cm)

31' 9" (9.7 m)

26' 3" (8.0 m)

0" (0.0 cm)

150" (381 cm)

120" (304.8 cm)

90" (228.6 cm)

23' 9" (7.2 m)

19' 8" (6.0 m)

0" (0.0 cm)

100" (254 cm)

80" (203.2 cm)

60" (152.4 cm)

15' 10" (4.8 m)

13' 1" (4.0 m)

0" (0.0 cm)

84" (213.3 cm)

67" (170.1 cm)

50" (127 cm)

13' 3" (4.0 m)

10' 11" (3.3 m)

0" (0.0 cm)

72" (182.8 cm)

58" (147.3 cm)

43" (109.2 cm)

11' 4" (3.5 m)

9' 4" (2.9 m)

0" (0.0 cm)

60" (152.4 cm)

48" (121.9 cm)

36" (91.4 cm)

9' 5" (2.9 m)

7' 9" (2.4 m)

0" (0.0 cm)

40" (101.6 cm)

32" (81.2 cm)

24" (60.9 cm)

6' 3" (1.9 m)

5' 2" (1.6 m)

0" (0.0 cm)

The formula for picture size and projection distance
L1 (ft)
= (0.048539X – 0.037278) / 0.3048
L2 (ft)
= (0.040172X – 0.037561) / 0.3048
H (in) = 0
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)

250" (635 cm)

218" (553.7 cm)

123" (312.4 cm)

–

35' 9" (10.9 m)

–20 27 64" (–51.9 cm)

225" (571.5 cm)

196" (497.8 cm)

110" (279.4 cm)

38' 11" (11.9 m)

32' 2" (9.8 m)

–18 25/64" (–46.7 cm)

200" (508 cm)

174" (441.9 cm)

98" (248.9 cm)

34' 7" (10.5 m)

28' 7" (8.7 m)

–16 22/64" (–41.5 cm)

150" (381 cm)

131" (332.7 cm)

74" (188 cm)

25' 11" (7.9 m)

21' 5" (6.5 m)

–12 16/64" (–31.1 cm)

133" (337.8 cm)

116" (294.6 cm)

65" (165.1 cm)

22' 11" (7.0 m)

18' 12" (5.8 m)

–10 56/64" (–27.6 cm)

106" (269.2 cm)

92" (233.6 cm)

52" (132 cm)

18' 3" (5.6 m)

15' 1" (4.6 m)

–8 42/64" (–22.0 cm)

100" (254 cm)

87" (220.9 cm)

49" (124.4 cm)

17' 3" (5.3 m)

14' 3" (4.3 m)

–8 11/64" (–20.8 cm)

92" (233.6 cm)

80" (203.2 cm)

45" (114.3 cm)

15' 10" (4.8 m)

13' 1" (4.0 m)

–7 33/64" (–19.1 cm)

84" (213.3 cm)

73" (185.4 cm)

41" (104.1 cm)

14' 5" (4.4 m)

11' 11" (3.6 m)

–6 55/64" (–17.4 cm)

72" (182.8 cm)

63" (160 cm)

35" (88.9 cm)

12' 4" (3.8 m)

10' 3" (3.1 m)

–5 57/64" (–14.9 cm)

60" (152.4 cm)

52" (132 cm)

29" (73.6 cm)

10' 3" (3.1 m)

8' 6" (2.6 m)

–4 58/64" (–12.5 cm)

40" (101.6 cm)

35" (88.9 cm)

20" (50.8 cm)

6' 10" (2.1 m)

5' 7" (1.7 m)

–3 17/64" (–8.3 cm)

The formula for picture size and projection distance
L1 (ft)
= (0.052882X – 0.037278) / 0.3048
L2 (ft)
= (0.043766X – 0.037561) / 0.3048
H (in) = –0.08171X

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.

20

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.