ENGLISH-5
Attaching / removing the projection lens (continued)
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.
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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
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Turn off the projector before removing the projection lens.
Note
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Focus correction requires some technical skill. Be sure to have a person with knowledge of
projectors or a service technician to perform adjustments.
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Do not touch the surface of the lens with bare hands. Finger prints and dirt on the surface
of the lens will be magnified by the lens and lower the quality of the projected image. Place
the supplied lens cover on the zoom lens when the projector is not in use.
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The lens is made of glass. The lens could be damaged if brought into contact with or
rubbed against hard objects. Handle the lens carefully.
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Use a clean, soft and dry cloth to wipe away dust and dirt from the projection lens.
Do not use fl uffy cloths containing oil, water or dust for cleaning. The lens is easily
damaged, so do not apply excessive pressure when wiping it.
Attaching the Lens / Detaching the Lens
For details on attaching or removing the projection lens, refer to the operating
instructions for the projector.
