Backfocusing Fixed-Focal-Length Lenses
1.
Install a lens and connect the camera to a monitor and power supply as described in
this manual.
2.
Open the iris completely. If an autoiris lens used, reduce the room lighting to allow the
lens to open completely. This gives the most accurate results.
3.
Adjust the screw slowly until the sharpest picture is obtained. This completes the
adjustment. The backfocus adjustment screw is held in place by friction, so there is no
locking screw.
Backfocusing Zoom Lenses
1.
Install a lens and connect the camera to a monitor and power supply. If the lens is
motorized, it must also be connected to a lens control.
2.
Position the camera 25~50 feet (8~16meters) from a flat vertical surface suitable for
focusing. A newspaper works well as a focusing target.
3.
Open the iris completely. If an autoiris lens used, reduce the room lighting to allow the
lens to open completely. This gives the most accurate results.
4.
Zoom the lens in to the maximum telephoto setting. Adjust the optical focus of the lens
using the remote lens control.
5.
Adjust the backfocus screw for the sharpest image.
6.
Zoom out to the maximum wide angle setting. If the picture is no longer in focus,
readjust the backfocus screw.
7.
Repeat steps 4~6 until the image remains sharp through the entire zoom range.
This completes the adjustment. The backfocus adjustment screw is held in place by
friction, so there is no locking screw.
XX135-00-00 Rev 1103 VC565DN Cameras
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