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Pelco Manual C1901M (4/99) 7
Information Box
Information Box
LENS TYPE
MANUAL IRIS
VARIABLE LIGHT CONDITIONS
STATIC LIGHT CONDITIONS
AUTO IRIS
• Turn Manual Iris ring so
iris is fully open and set
the Focus ring for ∞ (or
distant object).
• Adjust Backfocus with
CCD IRIS switch initially
set to the OFF position.
• Use the C/CS adjust-
ment POT on the side of
the camera to obtain the
best picture. This moves
the imager with respect
to the lens. (The picture
may bloom on either side
of the best setting within
the C/CS adjustment
range).
• Turn CCD IRIS switch to
ON position.
• Re-adjust manual iris, if
necessary, for optimal
lighting.
• Fine tune the LEVEL
control for best picture.
• Adjust Backfocus the same
as was done for Variable Light
conditions except CCD iris is
left in the OFF position; there-
fore, there is no need to ad-
just the LVL control; follow all
other steps, however.
L
H
LEVEL
A
B
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.
Manual
Iris
Manual
Focus
Sample Generic
Lens w/Manual
Iris & Focus
Generic example of best
setting for C mount lens.
Picture will be out
of focus on either
side of best setting
ON OFF
ON OFF
CCD Iris
c
cs
Best setting
CCD Iris
Lens/Camera Setup and Backfocusing