Lens Shift, Zoom & Focus; Scheimpflug Adjustment - Barco DP2K-12C Installation Manual

5. Lenses & lens holder
5.5 Lens shift, zoom & focus
Motorized lens adjustment
The DP2K C-series projector is equipped with a motorized lens shift functionality and a motorized zoom & focus functionality.
Maximum shift range
The lens can be shifted with respect to the DMD which result in a shifted image on the screen (Off-Axis). A 100% shift means that
the centre point of the projected image is shifted by half the screen size. In other words, the centre point of the projected image falls
together with the outline of the image in an On-Axis projection. Due to mechanical an optical limitations the shift range is limited as
well.
All DC2K lenses have a shift range of 50% up/down and 15% left/right. This range is valid for all throw ratios. Only the 0.98" DC2K
Zoom (1.95–3.2 : 1) lenses with item numbers R9855934 and R98559341 have a larger shift range of 128% up/down.
How to shift the lens of the DP2K C-series projector?
1. Use the up and down arrow keys on the local keypad to shift the lens vertically and use the left and right arrow keys on the
local keypad to shift the lens horizontally.
Image 5-15
How to zoom in or out?
1. Is the projector equipped with a motorized zoom & focus?
If yes, use the "+" and "-" zoom keys on the local keypad to zoom in or out.
Image 5-16
If no, use the zoom barrel on the lens to zoom in or out.
How to focus?
1. Is the projector equipped with a motorized zoom & focus?
If yes, use the "+" and "-" focus keys on the local keypad to focus the image on the screen.
Image 5-17
If no, use the focus barrel on the lens to focus the image on the screen.
5.6 Scheimpflug adjustment
What has to be done ?
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 sometimes happen 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 Sheimpflug'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).
42 R5905050 DP2K C-SERIES 10/07/2012