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6 Pelco Manual C1901M (4/99)
NOT AVAILABLE ON
3800 SERIES
Incident Light
LENS
CAMERA
(STYLIZED)
Iris opening (sometimes referred to as aperture) is
defined by f/stop numbers. The higher the number
the more closed the iris is.
IRIS
CCD
IMAGER
CCD Iris (Electronic Shutter) CCD out-
put voltage is electronically sampled
and used to adjust for small variations
in light levels. Normally used in indoor,
fixed position applications where small
variations in light levels might be en-
countered. CCD iris must be turned OFF
when performing camera/lens adjust-
ments.
CCS
AUTO-IRIS
Used when large varia-
tions in lighting are ex-
pected (usually outside).
There are two types of
auto-iris control:
MANUAL IRIS
MOTORIZED IRIS
DC CONTROL
• Iris operation con-
trolled by DC motor
voltages from the
camera
• Level control ON THE
CAMERA
• Only choice available
if you wish to use the
auto-iris feature with
B/W cameras
VIDEO CONTROL
MOTORIZED
ZOOM LENS
Zoom lens which
can be remotely
controlled for
zoom and focus.
MANUAL
LENS
The lens has
a focus ring
adjustment
on it.
• Iris adjustment ring is
on the lens
• Fixed position applica-
tions
• Indoor use
• Minimal light variations
• Iris has motor on it which
is controlled remotely by
the operator
• No automatic compen-
sation for light changes
CAMERA/LENS GEOMETRY–GENERAL INFORMATION
C/CS adjustment (all models) conditions camera mount
for lens type being used by changing physical distance
of imager face with respect to back of lens. Adjust-
ment screw or ring is initially positioned at the corre-
sponding C or CS position (corresponding to lens type)
and not some setting in between. Factory set at C
position.