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1-12 Setting the Beam Angle Technobeam
®
User Manual
Setting the Beam Angle
This section explains how to set the fixture’s beam angle. (It also
shows how to install the optional 8 to 12 degree narrow angle lens set.)
You can change the beam angle, for example, if you are having trouble
focusing precisely on a very detailed image.
Selecting a larger beam angle results in a larger-diameter image, but
can also result in some loss of image resolution and light intensity.
Note
All beam angles are accurate to ±1°.
1. Unplug the fixture and remove the access door shown in Figure 1-3 on
page 1-11 if you have not done so already.
2. Lay the fixture on its back and locate the lens tube as shown in Figure
1-6.
Figure 1-6. The lens tube contains the zoom lenses.
3. The lens tube cover has two latches on each side that secure it in place;
see Figure 1-7. Squeeze the latches together to remove the lens tube
cover.
Figure 1-7. Squeeze the two latches on each side of the lens tube to open
the cover.
Lens tube
Latches
(2 on each side)
Squeeze latches
(2 on each side of
lens tube)
Focus drive screw
located under lens tube
(turn drive screw to move
lens tube for easier access)