JVC V25U Instruction Manual - Page 20

Back Focus Adjustment

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Connection / Installation Inner Tripod Base Mounting Screws Make use of 1/4-20UNC screws. The length of the mounting screw shall be between 6 mm to 7 mm from the mounting surface. Caution: ● Using a screw with a length longer than specified may damage the internal parts of the camera, while using a length shorter than specified may cause the camera to fall off. Use a washer to adjust the length from the mounting surface. Mounting Plate Max. 7 mm Min. 6 mm Washer Back Focus Adjustment The CS mount is adjusted to the widest point of the applicable range by default. When using the zoom lens or C mount lens, or when the lens remains out of focus upon using the focus ring, readjustment is required. ● Follow the method below when necessary to adjust the back focus. ● In order to adjust the back focus accurately, do so according to the steps below upon opening the lens iris using the iris adjustment and ND filter. (ND filter is a filter that is used to evenly reduce the amount of light entering the lens at all wavelengths.) ● Connect a video monitor to the [MONITOR OUT] terminal at the rear of the unit, followed by adjusting as follows. Back Focus Adjustment Ring Fixed focus lens Adjust when the lens cannot be brought into focus using the focus ring. 1. Loosen the back focus fastening screw by using a Phillips screwdriver and turning it in the anti-clockwise direction 2. Shoot the object or a fine pattern that is farther away than the object 3. Set the focus ring of the lens to ∞ 4. Turn the back focus adjustment ring to obtain a sharp focus 5. Tighten the back focus fastening screw by turning it in the clockwise direction, and ensure that it is securely fastened Zoom lens Perform the zooming operation (Tele - Wide) and adjust accordingly if it is out of focus. 1. Loosen the back focus fastening screw by using a screwdriver and turning it in the anticlockwise direction 2. Shoot the object or a fine pattern that is farther away than the object 3. Set the zoom lens to Tele and turn the lens focus ring to adjust the focus 4. Set the zoom lens to Wide and turn the back focus adjustment ring to adjust the focus 5. Repeat Steps 3. and 4. for two to three times 6. Tighten the back focus fastening screw by turning it in the clockwise direction, and ensure that it is securely fastened 20 Loosen Tighten Back Focus Fastening Screw (M2.6) Lens Focus Ring

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20
Connection / Installation
Inner Tripod Base Mounting Screws
Make use of 1/4-20UNC screws. The length of
the mounting screw shall be between 6 mm to
7 mm from the mounting surface.
Caution:
●
Using a screw with a length longer than
specified may damage the internal parts of
the camera, while using a length shorter than
specified may cause the camera to fall off.
Use a washer to adjust the length from the
mounting surface.
The CS mount is adjusted to the widest point of
the applicable range by default. When using the
zoom lens or C mount lens, or when the lens
remains out of focus upon using the focus ring,
readjustment is required.
●
Follow the method below when necessary to
adjust the back focus.
●
In order to adjust the back focus accurately,
do so according to the steps below upon
opening the lens iris using the iris adjustment
and ND filter.
(ND filter is a filter that is used to evenly
reduce the amount of light entering the lens
at all wavelengths.)
●
Connect a video monitor to the [MONITOR
OUT] terminal at the rear of the unit, followed
by adjusting as follows.
Fixed focus lens
Adjust when the lens cannot be brought into
focus using the focus ring.
1.
Loosen the back focus fastening screw by
using a Phillips screwdriver and turning it in
the anti-clockwise direction
2.
Shoot the object or a fine pattern that is
farther away than the object
3.
Set the focus ring of the lens to
∞
4.
Turn the back focus adjustment ring to obtain
a sharp focus
5.
Tighten the back focus fastening screw by
turning it in the clockwise direction, and
ensure that it is securely fastened
Zoom lens
Perform the zooming operation (Tele - Wide)
and adjust accordingly if it is out of focus.
1.
Loosen the back focus fastening screw by
using a screwdriver and turning it in the anti-
clockwise direction
2.
Shoot the object or a fine pattern that is
farther away than the object
3.
Set the zoom lens to Tele and turn the lens
focus ring to adjust the focus
4.
Set the zoom lens to Wide and turn the back
focus adjustment ring to adjust the focus
5.
Repeat Steps 3. and 4. for two to three times
6.
Tighten the back focus fastening screw by
turning it in the clockwise direction, and
ensure that it is securely fastened
Back Focus Adjustment
Mounting Plate
Washer
Max. 7 mm
Min. 6 mm
Back Focus Adjustment Ring
Back Focus Fastening
Screw (M2.6)
Lens Focus Ring
Tighten
Loosen