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10 Pelco Manual C1902M (11/96)
Incident Light
LENS
CAMERA
(STYLIZED)
Iris opening (sometimes referred to as aperture) is
defined by f/stop numbers. The higher the # 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 po-
sition applications where small variations
in light levels might be encountered. CCD
iris must be turned OFF when perform-
ing camera/lens adjustments.
CCS
AUTO-IRIS
MANUAL IRISMOTORIZED IRIS
DC CONTROL VIDEO CONTROL
MOTORIZED
ZOOM LENS
Zoom lens which
can be remotely
controlled for zoom
and focus
Used when large
variations in lighting
are expected (usually
outside).There are two
types of auto-iris con-
trol
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 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
• Iris operation con-
trolled by video to
voltage motor con-
trol signals from the
camera
• Level control ON
THE LENS
• 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. Adjustment
screw or ring is initially positioned at the corresponding
C or CS position (corresponding to lens type) and not
some setting in between. Factory set at C position.