CCTV Operator Question: Download Questions PDF
Please explain how Do I Back Focus A Camera Fitted With A Zoom Lens?
Answer:
This can be achieved by following these steps:
☛ Set the lens to full wide angle view.
☛ Set the physical focus of the lens to infinity (clockwise viewed from the front).
☛ Aim the camera at an object at least 30 Meters away.
☛ Release the camera back focus mechanism.
☛ Adjust the back focus to obtain optimum clarity.
☛ Zoom the lens in to full telephoto and focus on a nearby object.
☛ Keep this object in view as you slowly zoom out and if all is set correctly it should remain in focus (track).
☛ Secure the back focus mechanism.
☛ Set the lens to full wide angle view.
☛ Set the physical focus of the lens to infinity (clockwise viewed from the front).
☛ Aim the camera at an object at least 30 Meters away.
☛ Release the camera back focus mechanism.
☛ Adjust the back focus to obtain optimum clarity.
☛ Zoom the lens in to full telephoto and focus on a nearby object.
☛ Keep this object in view as you slowly zoom out and if all is set correctly it should remain in focus (track).
☛ Secure the back focus mechanism.
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