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[ 10 ] Pelco Manual C1981M-C (8/02)
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 AI. Switch the
EI and AGC OFF. Refer to the lens instructions and adjust the lens for the optimum picture (video
output 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. 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 Adjust-
ment
section) and focus on the selected scene. Remove the ND filter and set the lens focus as re-
quired.
Direct Drive (DC) Auto Iris Lens
When a direct drive lens is used, the lens mode selector switch must be set to DD. Switch the EI and
AGC OFF. Use an appropriate screwdriver to turn the lens level potentiometer (refer to Figure 1)
fully clockwise. Next, slowly adjust the potentiometer counterclockwise until the optimum picture is
obtained (video output 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. 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
Set the EI switch and AGC switch to ON. To focus, set the lens focus to infinity and 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). Set the lens focus as required.
Manual Iris Lens
Set the EI switch and AGC switch to ON. 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 and set the iris for the best picture
quality. The largest aperture gives the best light sensitivity, 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 adjustment 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.
DIP SWITCH SETTINGS – WHITE REPRESENTS SWITCH POSITION
Figure 5. AGC and EI Switch Settings
*NOTE: For best results outdoors use an ND3 filter.
4
3
1
EI ON
4
3
EI OFF
7
7
AGC ON
AGC OFF