R5906113 UDX 07/07/2017 454. Lenses & Lens selectionLp1Lp24.5 Scheimpflug adjustmentWhat 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 le nsplane 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 focusedimage 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’slaw. To solve this the lens plane must be placed parallel with the DMD plane. This can be achieved by turning the lens holder toremove the tilt (or swing) between lens plane and DMD plane (Lp3→Lp4).Fp1Fp2DMDImage 4-17Scheimpflug principleScheimpflug principleThe "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When the DMD planeand lens plane are parallel, the plane of sharp focus will also be parallel to these two planes. If, however, the lensplane is tilted with respect to the DMD plane, the plane of sharp focus will also be tilted according to geometrical andoptical properties. The DMD plane, the principal lens plane and the sharp focus plane will intersect in a line below theprojector for downward lens tilt.Scheimpflug adjustment pointsImage 4-18Scheimpflug adjustmentsIndication on drawing Function1, 2 and 3 Scheimpflug adjustment screwsA, B and C Lock screws1, 2 and 3 are adjustment points.Necessary tools• Allen wrench 5 mm• Allen wrench 8 mmPreparation steps:1. Project a green focus test pattern in 4k.A B1 23 CFp4DMDLp3Lp4Fp3(Scheimpflug)SCREENSCREEN
