GE 4PE350A3 Instructions Manual page 272

EBI-6209B
ANGENIEUX ZOOM LENS
Zoom Lens and Drive Assembly
The Zoom Lens
is
cradled in a cast
housing which is
mounted on two guide
rods affixed to a horseshoe casting. The
entire assembly
is
securely fastened to
the General Electric Types PC -19-A and
PC -19-D Color Cameras. The zoom and focus
drive linkage, iris motor, wiring, and associ-
ated gears, are mounted within the zoom
lens cradle.
The focal length of the Zoom Lens is
monitored on a focal length meter mounted
on the Color Camera viewfinder. This meter
is
calibrated
in
steps
from 18mm to
18mm.
Zoom Control and Drive Assembly
The flywheel zoom control and the Zoom
Lens are linked together by a zoom drive
control rod, bevel gear block, zoom clutch,
and zoom wheel block. The zoom drive rod
is connected to the controlling mechanism
and the zoom lens by two universal coup-
lings. The zoom control potentiometer is
located on the end of the bevel gear block.
A large flywheel with ball handle is located
in the right-hand side of the Camera for
controlling zoom.
Focus Control and Drive Assembly
The panhandle, where all focusing is per-
formed, and the Zoom Lens are linked
together by a focus drive control rod and
a panhandle housing and shaft. The focus
drive rod is connected to the controlling
mechanism and the Zoom Lens by three
universal couplings and a focus rod bearing.
The panhandle is located on the left-hand
side of the Camera and focusing is per-
formed by turning the panhandle grip con-
trol. This produces linear movement of the
front section of the Zoom Lens. Lens move-
ment is controlled by a rotating shaft and
a focus bearing secured to the front sec-
tion of the Lens.
The focus drag control knob, just above
the panhandle grip, can be tightened to any
degree to restrict freeness of focusing move-
ment. A focus control protective clutch is
2
installed in the focus control handle to pre-
vent the Lens from being over -extended in
either the forward or reverse position. If
the drag control is securely tightened, the
panhandle grip focus control can be rotated
without producing Lens movement.
The position of the panhandle is adjust-
able from horizontal to 30 degrees below
horizontal by loosening the handle bolt. The
handle bolt must always be tightened after
the desired position has been attained. The
panhandle can be removed from the Camera
during transportation or storage.
A stop plate is located on the end of the
panhandle housing and shaft assembly to
prevent the handle from exceeding its tilting
limitations.
Iris Control
The Zoom Lens iris setting is controlled
from the Type PC -19-A Color Camera local
control panel by means of the EXP control.
Sun Shade
The sun shade prevents glare, halation, and
extraneous light from striking the Zoom Lens.
Extenders
The extenders supplied with the Camera
are designed to increase the focal length
of the standard 10:1 Zoom Lens. The 2X
extender increases the Zoom Lens focal
length to 360mm at f4.4. The 3X extender
increases the focal length to 54mm to 540mm
at f6.6. The extenders are normally used
for remote pickup.
Zoom Lens
The Lens focuses
a
corrected image
76.18mm behind the vertex of the last ele-
ment and zooms from 18mm to 180mm at
f2.2
for a Plumbicon* format. The Lens
focuses from three feet to infinity.
*Registered Tradmark of N.V. Philips'
Gloeilampenfabrieken of The Netherlands.