JVC TK-C1460U Instruction Manual - Page 21

Back focus adjustment Ⅲ Back focus adjustment Be sure to make back-focus adjustments when changing the lens mounting method or using a different lens. If required, adjust it as follows: ● To make accurate back focus adjustments, use the electronic shutter and the ND filter, and carry out the following adjustments in a state where the lens iris is released. (The ND filter acts to reduce the amount of incident light entering the lens evenly over the entire wavelength band.) Back focus adjustment ring Tighten Loosen BF LOCK Back focus locking screw (M2.6) Lens focus ring MEMO Focus setting can 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. • With a fixed-focus lens If the focus can not be adjusted correctly by rotating the lens focus ring, adjust the back focus as follows. 1. Loosen the back focus locking screw by turning it counterclocckwise ( ) with a screwdriver. 2. Shoot a pattern closely. 3. Turn the lens focus ring to ϱ. 4. Turn the back focus adjustment ring to focus at the best point. 5. Tighten the back focus locking 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 locking screw by turning it counterclocckwise ( ) with a screwdriver. 2. Shoot a comparatively dark scene with thin lines. 3. Set the lens to the maximum telephoto position, and adjust the lens focus. 4. Set the lens to the maximum wide-angle position, and turn the back focus ring to adjust the focus. (Repeat steps 3. and 4. two or three times.) 5. Tighten the back focus locking screw by turning it clockwise ( ). E-21