6-ENGLISH
Making Adjustments
Correcting the Focus
When the projection lens is attached to the projector and images are being projected
onto the screen, the peripheral focus may be out of focus in some localized areas.
In such cases, use the supplied spacers to correct the focus of these areas, and perform
adjustments so that the entire image is even.
■
Relationship between lens orientation and screen focus
If the projection lens is tilted with respect to the plane of the screen, uneven focus will
result. For example, when the front side of the lens (screen side) is tilted downward as
shown in the figure below (direction of the dotted arrow), the upper part of the screen
will be tilted backward and the lower part of the screen will be tilted forward.
Projection lens
Image formation surface
Screen surface versus focal point
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Procedure for correcting the focus
Attention
z
Turn off the projector before removing the projection lens.
Note
z
Focus correction requires some technical skill. Be sure to have a person with knowledge of
projectors or a service technician to perform adjustments.
z
This adjustment is not supported on the PT-MZ880 / PT-MZ780 / PT-MZ680.
D
C
A
B
Fig. 1
A
A
投写レンズ
ネジ
スペーサー
レンズマウンター
D
D
B
C
Fig. 2
Screws
Projection lens
Lens mounter
Spacers
1) Install the projector in the installation location, and turn it on to project an image.
2) Move the lens to its home position.
3) Operate the projector to shift the focus of the entire projected image toward
the front of the screen.
