Back Focusing a CCD Camera
Both the Victo & YSR-A Soccer Systems from Yujin come with a SAMSUNG SDC-410 CCD camera (768 x 494 pixel resolution) and an external 3.5mm~8.0mm Zoom Lens. This is supplied as new and may or may not need to be 'Back Focused'.
"When installing a zoom lens on a camera, you may find that the lens cannot be focused at either end of the zoom range.
If this problem occurs, you may need to adjust the camera back focus. By adjusting the back focus, you are changing the
position of the pick-up device in relation to the rear of the lens.
- Set up subject or test pattern 25 meters or more away from the camera. If this is not possible, choose the farthest object
from the camera.
- Important, set the iris at wide open. If the scene is too bright reduce illumination or use a filter to reduce the amount
of light coming into the lens. If the iris is not set all the way open, objects that are in focus during the day may fall
out of focus during nighttime viewing.
- Adjust the focus at extreme far.
- Adjust the zoom to extreme wide angle.
- If the camera is equipped with a pick-up device or camera lens mount set screw, loosen the screw.
- Adjust the pick-up device position screw or camera lens mount to obtain a clear picture.
- Adjust the zoom to extreme telephoto.
- Using the lens controller, adjust the lens for best focus. Do not adjust the camera.
- Adjust lens back to extreme wide angle.
- Readjust the camera for a clear picture.
- Tighten the pick-up device or camera lens mount set screw to ensure it does not change position.
- Repeat the above steps until the focus remains clear throughout the zoom range.
In most cases, changing a lens will not require this procedure. However, as lenses may vary from manufacturer to
manufacturer, this procedure may be necessary."
Credit - this informations was sourced from Rainbow CCTV's web site.