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THE IRIS CONTROL is the front lever that projects through the top of the optical system
housing. When this lever is to the left (as viewed from the rear of the unit), the largest aperture is provided.
Smaller apertures are obtained as the lever is moved to the left.
THE MAXIMUM FLOOD SPOT is obtained with the iris control lever to the right (near the op-
erating side) for the largest aperture and with the spot size con t rol handle moved as far to the rear as possible.
SMALLER SIZED SPOTS are projected as the spot size control handle is moved forward.
Most of the spot sizes needed will be produced with the iris in its maximum open position.
FOR A "HEAD SPOT," or any spot smaller than can be obtained with the spot size control
handle in its extreme forward position, shift the iris control lever to the left (away from operating side) for a
smaller aperture. The iris control lever should always be returned to its extreme right position before the spot
size control handle is again moved to obtain larger spots.
THE MASKING SHUTTER (chopper) lever is the middle lever projecting through the top of
the optical system housing. The masking shutter blades are operated by this lever to shape the projected spot
to a rectangle, strip spot, or dousing.
THE DISENGAGED POSITION of the masking shutter lever is to the ex t reme right (toward
operating side) and varying degrees of masking to complete cutoff are obtained by moving the lever to the left
(away from operating side). If dousing the spot for a prolonged period with the bulb operating, it is highly
recommended to use the Fadeout dousers (below) to prevent heat damage to the masking shutter blades.
THE ANGLE of the masking shutter blades can be adjusted to compensate for the horizontal
projection angle. Remove the color arm cover plate and dismount the boomerang. Loosen the (4) screws
holding each of the masking shutter blades enough to allow adjustments. Ignite the bulb and adjust the angle
of the bottom blade by tapping with a screwdriver so its projected edge lies parallel to the footlights. Tighten
the screw. Operate the masking shutter lever to close the blades. Adjust the upper blade to close in line with
the bottom blade and tighten the screw.
THE FADEOUT MECHANISM AND DOUSER CONTROL is the rear lever projecting
through the top of the optical system cover. This lever controls the in t ensity of light from complete fadeout
when the lever is to the left, to full inten s ity when the lever is to the right.
THE SPOT SIZE CONTROL HANDLE is located on the right hand side of the optical system
just above the base rail. A variation of spot sizes from full flood to small spot can be obtained by moving the
spot size control handle from one extreme to the other. Beam intensity is increased by this optical system
when reducing from flood to spot, and maximum intensity is reached when the spot size control handle is in
the extreme forward position. Compressing the brake lever forward of the handle permits free movement.
THE SPOT FOCUSING CONTROL KNOB is located on the operating side of the optical
system at the forward end above the base channel. This control is used to adjust the optical system for the
length of throw. When making an adjustment, rotate the spot focusing control knob until the sharpest edge is
obtained on the projected spot.
OPERATION OF OPTICAL SYSTEM
XG4/012
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