FLIR CF-5212, User And Installation Manual, Page: 129 / 132

Appendices
April 25, 2017 CF-5212/CF-5222 User and Installation Guide 119
A.6. Back Focus Adjustment
When to adjust back focus
Back focus refers to the distance from the rear lens element to the camera focal plane. In most cases,
it is required to adjust back focus only when the camera’s lens cannot hold focus throughout its zoom
range. If the focus cannot be achieved within the zoom range, you may need to adjust the back focus.
Requirements:
Tools required when carrying out back focus adjustment include:
Back focus adjuster (in the IP camera’s package)
Test chart/contrasting object
To adjust back focus
1. Set the Exposure Settings as follows:
In the Viewer, select the Camera tab.
From the Exposure menu, select Auto Shutter mode . See Camera-Related Settings .
2. Do the following:
View an object at least 75 feet (23 meters) away. For greater telephoto capable
lenses, the object can be located further away. If the field of view is less than this
distance, the object should be as distant as possible.
Adjust the zoom to the extreme telephoto position.
Adjust the focus to the best possible focused image.
If the image is not focused (sharp), loosen the back focus ring retaining screw with the
supplied hex tool and rotate the lens mount to adjust the back focus as needed to
achieve a sharp picture in focus.
Figure 112: Back Focus Adjustment
Zoom out to wide-angle position (for close FOV) and attempt to focus on a close
object (e.g. 1-3m.).
Repeat steps a. through e. until focus is optimal throughout the zoom range.
Tighten the back focus ring retaining screw to secure the ring in place.
Return the camera’s Exposure Setting to
Auto Iris if this was temporarily changed to
Auto Shutter mode during focusing.