JVC TK-C9300UA Instruction Manual - Page 12
Adjusting the Back Focus, With a Fixed-Focus Lens
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Setting/Adjustment Adjusting the Back Focus This camera is adjusted to an optimum wide range before shipment but readjustment is required when using zoom lens or when the lens focus ring is out of focus. Back focus adjustment ring Lens focus ring Tighten BF LOCK Loosen Back focus fastening screw (M2) . m 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 Shoot some fine patterns on the subject or away from the subject. 3 Turn the lens focus ring to ∞. 4 Turn the back focus adjustment ring to get the best focus. 5 Tighten the back focus fastening screw by turning it clockwise. With a Zoom Lens m 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 Shoot some fine patterns on the subject or away from the subject. 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. Memo v When the subject is bright and an ND filter is used, back focus adjustment can be performed more accurately. (An ND filter is a filter that reduces light incident on the lens of all wavelengths equally.) v Use the focus adjust mode for easy focusing. (A page 13) 12
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