Lens Calibration; Scheimpflug (Boresight) Adjustment - Barco Medea series Installation Manual

For more details concerning the calibration procedure, please refer to the section dedicated to the Lens
calibration in the GUI-system settings of the user manual.

5.5 Lens Calibration

About lens calibration
The lens calibration consists of going through full range to find the limits of the adjustment. The lens then
returns it to its original position. This operation allows to secure future actions on the lens like Zoom.
Each time a lens is manipulated e. g. removed and inserted in a projector, or a new one is inserted, it's
necessary to realize lens calibration.
Lens calibration is only available with Motorized lenses.
How to calibrate
First lens shift calibration is done in Production, but execute this operation at any time is possible by using the
OSD interface (System Settings → Maintenance → Lens Calibration).
For more details concerning the calibration procedure, please refer to the section dedicated to the Lens
calibration in the GUI-system settings of the user manual.

5.6 Scheimpflug (Boresight) adjustment

What is Scheimpflug?
The lens holder has to be adjusted so that the "sharp focus plane" of the projected image falls together with
the plane of the screen (Fp1→Fp2). This is achieved by changing the distance between the DMD plane and
the lens plane (Lp1→Lp2). The closer the lens plane comes to the DMD plane the further the sharp focus
plane will be. It can occur that you won't be able to get a complete focused image on the screen due to a tilt (or
swing) of the lens plane with respect to the DMD plane. This is also known as Scheimpflug's law. To solve this
the lens plane must be placed parallel with the DMD plane. This can be achieved by turning the lens holder to
remove the tilt (or swing) between lens plane and DMD plane (Lp3→Lp4).
Image 5-12: Scheimpflug principle
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.
Lenses
R5906141 /02 Medea series 45