Projection Distance And Screen Size; Setting The Amount Of Lens Shifting - JVC DLA-M2000LU 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.
90˚ 90˚ 90˚
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.
18

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
19