Scheimpflug Adjustment Procedure - Barco F90–W13 User Manual

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 F90 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.
4.8 Scheimpflug adjustment procedure
C
AUTION
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 distance 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 shift is in centre position.
3. If the installed lens has Iris control, open the Iris all the way up.
4. Open the focus ring all the way up.
5. Go to Main Menu / Test Patterns / Full Screen and select to display the Focus test pattern.
6. Zoom the lens to its widest 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. (image 4-9)
2. Adjust the left side Scheimpflug adjustment screw (reference 1) until the test image in the top right side of the screen is in focus.
Use a size 4 hex key to do this. (image 4-10)
Note: This process may cause the other areas of the image to slide out of focus. This is totally normal.
3. Adjust the right side Scheimpflug adjustment screw (reference 2) until the test image in the top left side of the screen is in focus.
Use a size 4 hex key to do this. (image 4-11)
Note: This process may cause the other areas of the image to slide out of focus. This is totally normal.
4. Adjust the top Scheimpflug adjustment screw (reference 3) until the test image in the bottom half of the screen is in focus. Use
a size 4 hex key to do this. (image 4-12)
Note: This process may cause the other areas of the image to slide out of focus. This is totally normal.
5. Continue adjusting the screws one at a time until the test image is uniformly sharp across all areas of the display.
601–0400–00 F90–W13 18/08/2016
:
A Scheimpflug adjustment should only be carried out by properly qualified and experienced pro-
4. Physical installation
33