Focusing The Beam - ETC Source Four jr User Manual

ETC User Manual
Source Four jr / jr Zoom
4: Once the lamp is centered, turn the outer knob clockwise to lock it in
5: Finally, turn the inner knob either clockwise or counterclockwise to

Focusing the beam

On a fixed field angle Source Four jr with a 26°, 36° or 50° lens, adjust the
lens single beam focus knob to focus the edge of the beam. On a Source Four
jr Zoom, adjust the position of both lens beam focus knobs to set the beam's
spread and to focus the edge of the beam. The Zoom lens provides a range
from 25° to 50°.
1: Loosen the beam focus
2: Slide the lens(es) forward or
3: Once the fixture is focused,
Source Four jr / jr Zoom
place.
achieve an optimum flat field. See figure below.
Flat field:
Best adjustment
knob(s) on the underside of
the barrel as shown at right.
backward to achieve the
desired beam edge.
tighten the beam focus
knob(s).
Hot spot:
Lamp pulled out
too far
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Field with hole:
Lamp pushed in
too far
Beam focus knobs
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