How do I back focus a camera with lens?

Issue

How do I back focus a camera with lens?

Product Line

Pelco Cameras

Environment

  • New Installation of a new Camera with new Lens.

Cause

Alignment of Camera imager to lens optics is required at first time setup

Resolution

BACK FOCUS OF LENSES

Fixed Lenses

  1. Lens aperture must be fully opened. (Use filters if necessary)
  2. Set focus ring of lens mid-range.
  3. Loosen camera’s sensor locking screw.
  4. Adjust the camera’s sensor to obtain best focus.
  5. Tighten all locking screws.

Zoom Lens Tracking

  1. Position test image or object at a minimum of 50 to 75 feet from the camera.
  2. Lens aperture must be fully opened. (Use filters if necessary)
  3. Set lens FOCUS to extreme FAR position.
  4. Adjust lens ZOOM to extreme WIDE angle of view.
  5. Adjust the camera’s sensor position for best focus.
  6. Adjust lens ZOOM to extreme TELEPHOTO position.
  7. Adjust the FOCUS control of the controller for best focus.
  8. Return lens to WIDE angle position.
  9. Re-adjust the camera’s sensor position for best focus.
  10. Tighten all locking screws.

Varifocal Lenses

  1. Lens aperture must be fully opened. (Use filters if necessary)
  2. Set focus ring of lens mid-range.
  3. Loosen camera’s sensor locking screw.
  4. Set the desired angle of view.
  5. Adjust the camera’s sensor to obtain best focus.
  6. Tighten all locking screws
Note* ND3 FILTER - A glass filter that attenuates light evenly over the visible spectrum. It would be used to reduce the amount of light entering a lens and thus force the iris open to its maximum. This is to simulate conditions of low light in order to set the focus accurately on the desired part of the scene, for low light operation.