4. Physical Installation
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane ca n be brought into sharp focus. W hen the DMD plane
and lens plane are parallel, the plane of sharp focus will als o be parallel to these two planes. If, h owever, 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
Scheimp flug adjustment points are located o n t he lens mount. The F70 has three (3) s et screws and three (3) adjustment screws.
When to apply Scheimpflug?
Scheimpflug c orrection procedures may o nly be carried out by suitably trained and experienced technicians.
A Scheimpflug correction should only be applied wh en the overall focus of the projected image is not equally sharp (for exam ple, if the
projector is NOT in parallel with the screen or as a result of a previously misaligned Sc heimpflug). Be aware that the consequence of
applying Scheimpflug correction upon a s creen not in parallel with the projector is that the p rojected image differs from the rectangle
shaped image. In other words “distortion” of the projected image occurs. M asking will be required to solve the distortion.
The dis advantage of M ask ing is loss of c ontent. Therefore it is strongly reco mmended to place the projector in parallel with the
projection screen and us e 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 c an be applied.
4.9 Scheimpflug adjustment procedure
CAUTION: A Scheimpflug adjustment should only be carried out by properly qualified and exp erienced pro-
jection specialists. A poor Scheimpflug adjustment may result in an extremely degraded image and will require
factory—servicing to the projector.
Necessary tools
• Allen key, hex size 4
• Allen key, hex size 6
Preparation
1. Prepare the test area. Barco recommends a projector-screen d istance of 2 metres be used for all Scheimpflug adjustments.
Verify that the throw ratio of the installed lens matches the requirements of the installation area (projection distance and screen
size).
2. Check that the lens is correctly installed, and lens s hift is in centre position.
3. If the installed lens ha s Iris control, open the Iris a
ll the way up.
4. Open the focus ring all the way up.
5. Go to Main M enu / Test P atterns / Full Screen and select to display the Foc us test pattern.
6. Zoom the lens to its wides t opening (maximum image size on the screen).
Apply a Scheimpflug correction
1. Loosen the three set screws (reference 1b, 2b, 3b). Use a size 6 hex key to do this.
601–426 F70 SERIES 24/10/2017 39
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