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12 Pelco Manual C1902M (11/96)
Backfocusing
MANUAL IRIS
AUTO IRIS
A
B
• Set all other switches on the
back of the Camera to the
left (deactivated or OFF), in-
cluding the CCD Iris
switch.
• This step is the same as the
one for DC SERVO, excpt
that the AUTO IRIS VIDEO/
DC switch is set to VIDEO,
both models.
CC4600 Series
CC3300 Series
**With CCD Iris
OFF, the Video
Level control is
inactive
CCD Iris** (OFF)
Sync
AGC
Gain
BLC
White
Aperture
CCD IRIS**
AGC
BLC
TURBO AGC
L
H
IRIS LEVEL
L
H
VIDEO LEVEL
DC SERVO
VIDEO SERVO
The purpose of backfocusing is to make the adjustments necessary for the picture to remain in focus throughout the camera‘s zoom
range, which is the case, for instance, in motorized zoom, auto iris configurations. Manual Iris lens/camera combinations also need to
be backfocused Follow the general instructions listed below to adjust backfocus appropriate to your camera/lens combination
AUTO IRIS
VIDEO DC
NOTE: Most auto-iris configurations are associated with motorized zoom
lenses, so the instructions below are based on that assumption
• This step, same as for DC
servo, both models.
• This step, same as for DC
servo, both models.
• For AUTO IRIS applications
using VIDEO servo, set the
IRIS/VIDEO LEVEL on the
rear of the respective units
to H.
BACKFOCUS ADJUSTMENT
• Adjust focus to far, zoom to
wide angle.
• Adjust C/CS adjustment
Ring on the camera for the
best picture.
• Zoom to a close object; ad-
just lens controller or focus
for best picture.
• Repeat above until lens re-
mains in focus throughout
the zoom range (far to near).
• Tighten the Lock Screw.
The ability of a zoom lens to remain in focus throughout its zoom range is known as Tracking
Information Box
Information Box
Lens/Camera Setup and Backfocusing
• Make sure the Auto IrisVideo/
DC switch is in the DC posi-
tion. Use a neutral density
filter or some other physical
means to decrease the
amount of light entering the
camera lens so that the auto-
iris response is to open the iris
up as wide as possible.
AUTO IRIS
VIDEO DC
• Finally, use the IRIS/VIDEO
LEVEL adjustment on the
REAR of the CAMERA to
adjust for best picture
• Adjust other settings on cam-
era as needed.
LENS TYPE
Generic example of best
setting for C mount lens.
Picture will be out
of focus on either
side of best setting
Best setting
Adjustment
Ring