JVC VN-C11 manual Preparations Adjusting the Camera, For a fixed-focus lens, For a zoom lens

Preparations (Step 3 Adjusting the Camera)

Back-focus Adjustment

At the factory, back-focus is set at the point for the widest range of use for CS-mount. However, it is necessary to readjust back focus if a zoom or C-mount lens is used or if focus cannot be attained using the focus ring of the lens. To adjust, follow the procedures described below.

In order to adjust back-focus appropriately, use the iris adjustment function and an ND filter to re- lease the lens iris before proceeding with the adjustment. (An ND filter acts to reduce the overall amount of light entering the lens equally over all wavelengths.)

Connect the MONITOR OUT terminal on the rear panel to the monitor TV. To adjust, follow the procedures described below.

Back focus adjustment ring

Tighten

Loosen

Back focus locking screw (M2.6)

Lens focus ring

<For a fixed-focus lens>

If focus cannot be attained using the focus ring of the lens, adjust the back-focus as follows.

1.Loosen the back-focus lock screw by turning it counterclockwise with a Phillips screwdriver.

2.Aim the camera at the object or a spot of detail somewhere away from the object while checking the image on the PC screen.

3.Turn the focus ring to .

4.Turn the back-focus adjustment ring to optimize the focus.

5.Tighten the back-focus lock screw securely by turning it clockwise.

<For a zoom lens>

If the image gets out of focus when zoomed in/ out, adjust the camera as follows:

1.Loosen the back-focus locking screw by turning it counterclockwise with a Phillips screwdriver.

2.Aim the camera at the object or a spot of detail somewhere away from the object while checking the image on the PC screen.

3.Zoom in the lens and adjust the focus by turning the focus ring.

4.Zoom out the lens and adjust the focus by turning the focus ring.

5.Repeat steps 3 and 4 a few times.

6.Tighten the back-focus locking screw securely by turning it clockwise.

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