Genesis CCTV BC-540WDR, User Manual

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3. Back-Focus Adjustment
- When a lens is mounted, back-focus adjustment can be
required. Adjust with the lens focus ring when the correct
focus cannot be obtained.
4. With a Fixed-Focus Lens
- Fully open the aperture and set the focus ring to
“∞”(infinity). In the case of an auto IRIS lens only, shoot a
comparatively dark object so that the aperture is fully open.
- Loosen the back-focus screw with a L-wrench, and turn the lens mount to focus.
- After adjusting the back-focus, tighten the back-focus screw.
5. With a Vari-focal Lens
- Fully open the aperture and set the lens to the maximum tele-photo position. Then turn the focus ring
to focus. In case of an auto IRIS lens only, shoot a comparatively dark object so that aperture is fully
open.
- Set the lens to its maximum wide-angle position.
- Loosen the back-focus screw with a L-wrench, and turn the lens mount to focus. After adjusting the
back-focus, tighten the back-focus screw.
- Repeat above step until the difference between focusing position “Tele” and “Wide” becomes the
smallest.