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 mechanical and
optical limitations the shift range is limited as well.
All DC4K lenses have 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. Con
fi
guring the projector outside these shift ranges will result in a slight
decline of image 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
P
DMD.
F
Field of view.
It’s mechanical possible to shift outside the recommended
fi
eld of view, but this will result in a decline of
image quality depending on the used lens and the zoom position of the used lens. Furthermore, shifting too
much in both directions will result in a blurred image corner.
How to shift the lens of the Thor ?
1. Use the
up and down
arrow buttons on the Local Keypad to shift the lens
vertically
and use the
left and right
arrow buttons
on the Local Keypad to shift the lens
horizontally
.
SHIFT
SHIFT
Image 3-7
How to zoom in or out?
1. Use the “+” and “-”
zoom buttons
on the Local Keypad to zoom in or out.
ZOOM
ZOOM
Image 3-8
How to focus?
1. Use the “+” and “-”
focus buttons
on the Local Keypad to focus the image 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 phenomenon for projection lenses used with high brightness projectors. The
operation temperature of the lens is reached after approximately 30 minutes projection of average video.
20
R5906787 THOR 26/01/2018
Summary of Contents for Thor
Page 1: ...Thor User manual R5906787 02 26 01 2018...
Page 6: ...Table of contents 2 R5906787 THOR 26 01 2018...
Page 8: ...1 Welcome 4 R5906787 THOR 26 01 2018...
Page 26: ...3 Lenses Lens selection 22 R5906787 THOR 26 01 2018...
Page 34: ...4 Input Communication 30 R5906787 THOR 26 01 2018...
Page 62: ...6 Starting up 58 R5906787 THOR 26 01 2018...