3. Lenses & Lens selection
Maximum shift range
The lens can be shifted with respect to the internal optics of the projector (DMD) which results 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 m echanical and
optical limitations the s hift range is limited as well.
All DC4K lenses hav e a shift range of 50% up, 50% down, 17% left, and 17% right. This range is valid for all throw ratios. Within
these shift ranges the projector and lens perform excellently. Configuring the projector outside these shift ranges will result in a slight
decline of imag e quality.
U
D
SIDE VIEW
P
F
TOP VIEW
P
F
L
R
+50%
-50%
-17%
+17%
U
D
L R
P
F
+50%
-50%
-17% +17%
Image 3-6
PDMD.
F Field of v iew.
It’s mechanical possible to shift outside the recomm ended field of view, b ut this will result in a decline of
image quality depending on the used lens and the zoom position of the used lens. Furthe rmore, shifting too
much in both directions will result in a blurred im age corner.
How to s hift the lens of the Thor ?
1. Use the up and down arrow buttons on the Local K eypad to shift the lens vertically and use the left and right arrow buttons
on th e Local Keypa d to shift the lens horizontally.
SHIFT
Image 3-7
How to zoom in or out?
1. Us e the “+” and “-” zoom buttons o n the Local Ke ypad to zoom in or out.
ZOOM
Image 3-8
How to focus?
1. Use the “ +” and “-” focus b uttons on the Local Keypad to focus the ima ge on the screen.
FOCUS
Image 3-9
Take into account that the lens focus may slightly drift while the lens is warming up from cold to operation
temperature. This is a typical p henomen on for p rojection lenses used with hi gh b rightness projectors. The
operation temperature of the len s is reached af ter app roximately 30 minutes projection of averag e video.
20 R5906787 THOR 26/01/2018
To Next Page
Loading...
Need help?
General
