Epson PowerLite 84 User's Guide - Page 106

you'll have to tilt the projector upward if you want to fill the whole, bottom of the screen

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If you're mounting the projector on the ceiling and you place it above screen level, you'll have to tilt the projector down to position the image on the screen. This causes the image to lose its square shape. You can correct the distortion using the Keystone function in the projector's menu system (see page 67). If you place the projector so that the base of the lens is level with the bottom of the screen, the image should be square and you won't have to adjust it. If you place the lens lower than the bottom of the screen, you'll have to tilt the projector upward if you want to fill the whole screen with the image. The following illustrations provide measurements you can use when installing the projector: 3.7 in. (95 mm) .5 in. (13 mm) 3.3 in. (85 mm) 12.8 in. (327 mm) 2.2 in. 57 mm Distance from center of lens to suspension bracket mounting point 3.9 in. (98 mm) 3.6 in. (92 mm) 9.8 in. (250 mm) 106 Projector Installation 5 in. (127 mm) 9.5 in. (242 mm) 2.8 in. (71 mm)

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106
Projector Installation
If you’re mounting the projector on the ceiling and you place it above
screen level, you’ll have to tilt the projector down to position the
image on the screen. This causes the image to lose its square shape.
You can correct the distortion using the
Keystone
function in the
projector’s menu system (see page 67).
If you place the projector so that the base of the lens is level with the
bottom of the screen, the image should be square and you won’t have
to adjust it. If you place the lens lower than the bottom of the screen,
you’ll have to tilt the projector upward if you want to fill the whole
screen with the image.
The following illustrations provide measurements you can use when
installing the projector:
Distance from
center of lens to
suspension
bracket
mounting point
3.7 in.
(95 mm)
.5 in.
(13 mm)
12.8 in. (327 mm)
3.3 in.
(85 mm)
2.2 in.
57 mm
3.9 in.
(98 mm)
3.6 in.
(92 mm)
5 in. (127 mm)
9.5 in. (242 mm)
2.8 in.
(71 mm)
9.8 in.
(250 mm)