Barco F70 Series, User Manual

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Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When
the DMD plane and lens plane are parallel, the plane of sharp focus will also be parallel to these two
planes. If, however, the lens plane is tilted with respect to the DMD plane, the plane of sharp focus
will also be tilted according to geometrical and optical properties. The DMD plane, the principal lens
plane and the sharp focus plane will intersect in a line below the projector for downward lens tilt.
Scheimpflug adjustment points
Scheimpflug adjustment points are located on the lens mount. The projector has three (3) set screws and
three (3) adjustment screws.
When to apply Scheimpflug?
Scheimpflug correction procedures may only be carried out by suitably trained and experienced
technicians.
A Scheimpflug correction should only be applied when the overall focus of the projected image is not equally
sharp (for example, if the projector is
NOT in parallel with the screen or as a result of a previously misaligned
Scheimpflug). Be aware that the consequence of applying Scheimpflug correction upon a screen not in
parallel with the projector is that the projected image differs from the rectangle shaped image. In other words
“
distortion ” of the projected image occurs. Masking will be required to solve the distortion.
The disadvantage of Masking is loss of content. Therefore it is strongly recommended to place the projector
in parallel with the projection screen and use the SHIFT functionality of the Lens Holder to match the
projected image with the projection screen. If the SHIFT range is not sufficient then the projector can be tilted
and Scheimpflug can be applied.
CAUTION: A Scheimpflug adjustment should only be carried out by properly qualified and
experienced projection specialists. A poor Scheimpflug adjustment may result in an extremely
degraded image and will require factory—servicing to the projector.
4.9 Scheimpflug adjustment procedure
CAUTION: A Scheimpflug adjustment should only be carried out by properly qualified and
experienced projection specialists. A poor Scheimpflug adjustment may result in an extremely
degraded image and will require factory—servicing to the projector.
Required tools
• Allen key, hex size 4
• Allen key, hex size 6
Lens distance
Distance from lens to the screen during Scheimpflug adjustment.
Lens Distance
EN64* 3,0 m
EN76* 2,5 m
All other approved
lenses*
2,0 m
* With one of these lenses installed, ensure that the white dot (reference 1) on the focus ring is oriented 60
degrees counterclockwise from vertical.
Physical Installation