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Pelco Manual C1900M (4/99) 13
Information Box
Information Box
Lens/Camera Setup and Backfocusing
LENS TYPE
MANUAL IRIS
VARIABLE LIGHT CONDITIONS
STATIC LIGHT CONDITIONS
AUTO IRIS
A
B
• Turn manual iris
ring so iris is fully
open and set the fo-
cus ring for
∞
(or
distant object).
• Adjust back focus the
same as was done for vari-
able light conditions except
CCD Iris is left in the OFF
position; therefore there is
no need to adjust the Iris
Level control; follow all
other steps, however.
*With CCD Iris
OFF, the Iris Level
control is inactive
AGC
TURBO
AGC
CCD IRIS*
L
H
IRIS LEVEL
AGC
TURBO AGC
BLC
CCD IRIS (ON)
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 back focus appropriate to your camera/lens combination.
NOTE: We are essentially referencing indoor lighting condi-
tions in each of the cases below. If you have occasion to use
fixed lenses in an outdoor setting, where lighting is much brighter
(not widely done with fixed lenses), you may need to filter the
light while performing these adjustments.
• Set the Iris Level con-
trol pot to the H position.
• Adjust or set other cam-
era switches as needed.
• Move CCD Iris switch
to the ON position.
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
• Adjust the C/CS ad-
justment ring for
the best picture.
• Set all other switch-
es on the back of the
camera to the left
(deactivated or OFF),
including the CCD
Iris switch.
Manual
Iris
Manual
Focus
Generic Lens with Manual
Iris and Focus