radiance 7201111, Instruction Manual

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OPERATION OF OPTICAL SYSTEM
THE SPOT SIZE CONTROL (ZOOM) is located on the right side of the optical system
protruding from a slot in the spotlight housing. A variation of spot sizes from full flood to a small spot
can be obtained by moving the zoom control 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
zoom is in the extreme forward position. Depressing a thumb lever adjacent to the control permits free
movement forward and back, and releasing the thumb lever locks the control in position.
ROTATING THE ZOOM KNOB operates the spot focus control. When making an
adjustment, rotate the focus control until the sharpest edge is obtained on the projected spot. Moving
the large lens to its center of travel and then adjusting for a sharp edge should give satisfactory results
for the full movement of the lens system.
THE THREE BEAM-SHAPING CONTROL LEVERS are located immediately in front
of the fade-out lever and project through the top of the optical system housing. The iris control is the
center lever. When this lever is to the left (viewing the spotlamp from the rear), the largest aperture is
provided. Smaller apertures are obtained as the lever is moved to the right.
THE MAXIMUM FLOOD SPOT is obtained with the iris control lever to the left (away
from operating side) for the large aperture and with the zoom control moved as far as possible toward
the rear. Smaller sized spots are projected as the zoom control 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 size smaller than can be obtained with the zoom
control in its extreme forward position, shift the iris control lever to the right (toward operating side) for
a smaller aperture. The iris control lever should always be returned to its extreme left position before
the zoom control is again moved to obtain larger spots.
THE HORIZONTAL MASKING SHUTTER LEVER is the
second (from the rear) lever projecting through the top of the optical system
housing. The horizontal masking shutter blades are operated by this lever to
shape the projected spot to a rectangle, strip spot, or for dousing.
THE VERTICAL MASKING SHUTTER LEVER is the lever
in front of the iris control. The vertical masking shutter blades are operated by
this lever to narrow the projected spot from full width to complete douse.
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