JVC TK-C926EG, TK-C1530U manual Adjusting the back focus, With a fixed-focus lens, With a zoom lens

Setup

Adjusting the back focus

This camera is adjusted to a optimum wide range for CS-mount lens before shipment but readjustment is required when using zoom lens or C-mount lens or when the lens focus ring is out of focus. Use the following methods to adjust the back focus.

Back focus adjustment ring

Tighten

Loosen

Back focus fastening screw (M2.6)

Lens focus ring

With a fixed-focus lens

If the focus cannot be adjusted correctly with the lens focus ring, adjust the back focus as follows.

1. Loosen the back focus fastening screw by turning it anti-clockwise with a + screwdriver.

2. Shooting an object or a picture with fine patterns that is away from the object

3. Turn the lens focus ring to ∞.

4. Turn the back focus adjustment ring to focus at the best point.

5. Tighten the back focus fastening screw by turning it clockwise.

With a zoom lens

If the image is out of focus when zooming (telephoto - wide angle), adjust the camera as follows.

1. Loosen the back focus fastening screw by turning it anti-clockwise with a + screwdriver.

2. Shooting an object or a picture with fine patterns that is away from the object

3. Zoom to the maximum telephoto position and turn the lens focus ring to adjust the focus.

4. Zoom to the maximum wide angle position and turn the back focus adjustment ring to adjust the focus.

5. Repeat steps 3 and 4 two or three times.

6. Tighten the back focus fastening screw by turning it clockwise.

Note:

●In the case of B&W/Color mode, the lens performance may cause the image to be out of focus when the illumination of the object is near-infrared light. In such a case, use a lens that is compatible with near-infrared light.

Memo:

●Focus setting may differ on the color and on the black and white screen. Make adjustments so that the focus will come to the optimum on both screens.

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