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Pelco Manual C1985M-E (4/03)
LENS SETUP AND FOCUS PROCEDURES
Video Drive Auto Iris Lens
When a video drive auto iris lens is used, the lens mode selector switch must be set to AIV. Switch the
ESC and AGC OFF. Refer to the lens instructions and adjust the lens for the optimum picture (video out-
put level of 1V peak-to-peak). Switch the AGC ON. To focus, fully open the iris by covering the lens with a
suitable neutral density (ND*) filter. Set the lens focus to infinity (far). Select the scene to be viewed.
Use the back focus adjustment ring (refer to the
Back Focus Adjustment
section) to focus on the selected
scene. Remove the ND filter and set the lens focus as required.
Direct Drive (DC) Auto Iris Lens
Set the lens mode selector switch to AID. Switch the ESC ON. Use an appropriate screwdriver to turn the
lens level potentiometer (refer to Figure 1) fully clockwise. Next, slowly adjust the potentiometer counter-
clockwise until the optimum picture is obtained (video output level of 1V peak-to-peak). To focus, fully
open the iris by covering the lens with a suitable neutral density (ND*) filter. Select the scene to be
viewed. If the viewed scene is 6.5 feet (2 m) away or farther, set the lens focus to infinity (far). Use the
back focus adjustment ring (refer to the Back Focus Adjustment section) and focus on the selected
scene. Remove the ND filter and set the lens focus as required.
Fixed Lens
To focus, set the lens focus to infinity and view an image greater than 6.5 feet (2 m) away. Focus the im-
age with the back focus adjustment ring (refer to the
Back Focus Adjustment
section). Set the lens focus
as required.
Manual Iris Lens
To focus, open the iris fully and set the lens focus to infinity. View an image greater than 6.5 feet (2 m)
away. Focus the image with the back focus adjustment ring (refer to the
Back Focus Adjustment
section).
Adjust the lens focus, set the iris for the best picture quality. The largest aperture gives the best light sen-
sitivity, the smallest aperture the greatest depth of field.
Zoom Lens
Set the lens focus to infinity (far) and fully open the iris by covering the lens with a suitable neutral density
(ND*) filter. Zoom out to the widest field of vision and view a distant object. Adjust the back focus adjust-
ment ring until the object is in focus (refer to the
Back Focus Adjustment
section). Next, zoom fully in and
adjust the lens focus until the object is again focused. Repeat these steps until the full zoom range may
be viewed with the minimum loss of focus.
*NOTE:
For best results in outdoor lighting situations use an ND3 filter to focus the camera.