GE 4PE350A3 Instructions Manual page 274

EBI-6209B
ANGENIEUX ZOOM LENS
OPERATION
Zoom Control
Three and one-half turns of the flywheel
zoom control
in
the
clockwise direction
causes the Zoom Lens to zoom from the
wide-angle position (18mm) to the telephoto
position (180mm). The Lens is protected
by a zoom clutch which permits overriding
at both ends of the flywheel zoom control.
Therefore, there is no relationship between
the position of the flywheel handle and the
focal length of the zoom lens.
Focus Control
To
focus the Lens at the
three-foot
minimum focusing distance, the panhandle
grip focus must be rotated fully counter-
clockwise.
Full focus of the Zoom Lens
is achieved
by
rotating the panhandle
grip focus control three and one-half turns
in the
clockwise direction. The overrid-
ing clutch
in
the panhandle protects the
Zoom Lens at both of its extreme posi-
tions.
The focus drag control can be set to suit
the operator and existing conditions. Mini-
mum friction setting of the drag control
permits rotation of the panhandle grip fo-
cus control by sliding the palm of the hand
over the control.
Program Focusing
To keep the Color Camera in focus, the
cameraman should aim it at the subject,
zoom the lens into the telephoto position,
focus,
and then zoom out and frame the
subject in the viewfinder. As long as the
Camera -to -subject distance does not change,
the Camera remains correctly focused from
the wide angle to the telephoto position of
the zoom lens.
If the Camera -to -subject distance changes,
the most critical adjustment is in the tele-
photo end of the zoom lens range. Correct
Camera focus in the wide angle position
of
the zoom lens
is dependent upon the
correct lens -to -subject focus when the lens
is zoomed into the most telephoto position.
MAINTENANCE
To obtain maximum life and satisfactory
operation from the Angenieux Zoom Lens,
establish a regular maintenance schedule.
Pay careful attention to the Care and Clean-
ing of Optical Lenses section, below.
Keep the equipment as clean and dry as pos-
sible. An air blower or brush with long, soft
bristles makes an excellent dust remover.
Before installing any replacement parts,
check to determine the cause of failure. When
replacing components, select the proper re-
placement part from Figs. 1 and 2 using
the GE or Zoomar drawing number and name
given.
Care and Cleaning of Optical Lenses
GENERAL
It is of extreme importance that the fol-
lowing suggestions and methods for clean -
4
ing the optical surfaces associated with the
Zoomar Lens be followed. These cleaning
procedures have been proven by lens manu-
facturers, and any deviation from them will
result in scratching the optical surfaces.
WARNING
DO NOT UNDER ANY CIRCUM-
STANCES USE ANY TYPE OF
CLEANING POWDERS ON OPTICAL
SURFACES.
CARE OF COATED LENS SURFACES
Any water or oil accidentally spilled on
the optical surfaces must be immediately
removed; otherwise, a distorted or imper-
fect image will be evident when the signal
is transmitted. Cleaning devices should be