Projection Distance And Screen Size; Setting The Amount Of Lens Shifting - JVC DLA-G150CLU Operating Instructions Manual

Installing the Projector

Projection Distance and Screen Size

• The range of projection distances that can be focused depends on the lens unit (optional) to be used. When the aspect ratio
of the screen is 4:3, the range is as follows and you need to install the projector within this range.
Lens type Approximate projection distance
GL-M2910G 0.77 m to 4.03 m
GL-M2915SG 1.76 m to 4.50 m
GL-M2920ZG 2.77 m to 19.71 m
GL-M2930SZG 4.74 m to 29.87 m
*: The value for projection distance is a guide (reference) one. The projected image size may vary depending on the
manufacturing tolerance of the projection lens.
Screen
Screen with 4:3 aspect ratio
90˚ 90˚ 90˚
Center line of the lens
To move the Shift position by 50%, set the bottom edge of the projec-
tion screen so that it is at the same height as the center of the lens.
Notes
• For detailed relationship between projection distances and projection screen sizes, refer to Appendix A. The relationships for
both 4:3 and 16:9 ratios are listed there.
• When installing a screen, use a 4:3 aspect-ratio picture.
• (A 16 : 9 aspect-ratio picture is projected based on the width of the range in which a 4:3 aspect-ratio picture is projected.)
• The diagonal length of a 16:9 aspect-ratio screen is about 91.8% that of a 4:3 aspect-ratio screen. This value is only a guide
(reference).
• If sunlight or lamp light strikes the projection screen directly, the picture tends to become pale and dim. Use a curtain or
other means to shield the light.
• Set the projector horizontally on a surface that is within the range of adjustable angles (up/down adjustment angle: +7° ;
horizontal adjustment angle: ±1.5°).
• If the keystone is adjusted, the projected screen becomes smaller.
• When hanging from the ceiling, use a dedicated hanging fixture (not supplied).
Optional Lenses
This projector does not include a lens. You can select one of the optional lenses to adjust the projection distance. Please ask
your authorized dealer or service center to install the lens.
Lens model Function
GL-M2910G Powered focus for rear projection, short focal length (subject ratio 1:1), 0% influence.
Powered focus, short focal length (subject ratio 1.5:1), powered image adjustment (2%
GL-M2915SG
zoom), includes manual vertical shift function, 30%-55% influence
GL-M2920ZG Powered zoom/powered focus lens (subject ratio 2:1-3:1), 50% influence.
Powered zoom/powered focus long focal length lens (subject ratio 2.9:1-5.5:1), includes
GL-M2930SZG
manual vertical shift function, 30%-55% influence.
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Change of projection screen
according to aspect ratio
Screen with 16:9 aspect ratio

Setting the Amount of Lens Shifting

When the lens unit (optional) with the lens shifting function is used, the projected screen can be shifted up and down in
position.
Notes
• The amount of shifting is within the range of approx. 30% to 55%.
• After finishing the lens shift setting, tighten the SHIFT LOCK fixing bolt firmly so that the lens will not move.
1
Turn the cap on the top of the projector to open it.
2
Loosen the SHIFT LOCK fixing bolt.
Use the hex. wrench supplied.
3
Rotate the LENS SHIFT knob to adjust the position (shift amount) of the projected
screen.
Rotate it to the right: The lens shifts upward.
Rotate it to the left: The lens shifts downward.
4
Tighten the SHIFT LOCK fixing bolt firmly.
Use the hex. wrench supplied.
5
Turn the cap to close it.
SHIFT LOCK fixing bolt
LENS SHIFT knob
Projected screen position image by amount of shift
* The projected screen position can only shift in an up-and-down direction.
The illustration shows the screen shifted sidewise for the purpose of explanation.
Approx. 55%
Approx. 50%
Approx. 30%
Installing the Projector
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