Backfocus adjustment screw
This screw is used to position the CCD image sensor at the precise
point of focus of the lens.
Backfocusing fixed-focal-length lenses
Install a lens and connect the camera to a monitor and power
supply as described elsewhere in this manual.
2. Open the iris completely. If an
lens is 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
meters) from a flat vertical
surface suitable for focusing.
A newspaper works well as a
focusing target.
3. Open the iris completely. If an
lens is used, reduce the
room
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.
