JVC VN-C20 - Manual (Page 19)

19
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 the lens is out of focus,
readjustment is required using the focus ring.
● When required, follow the method below 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 light entering the lens at all
wavelengths.)
● Connect a monitor TV to the [VIDEO OUT] 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 locking screw in the
anti-clockwise direction using a Phillips
screwdriver
2.
Shoot the object or a fine pattern that is
farther away than the object
3.
Set the focus ring of the lens to 1
∞
4.
Turn the Back Focus adjustment ring to
optimize the focus
5.
Turn the Back Focus locking screw 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 locking screw in the
anti-clockwise direction using a screwdriver
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 2 to 3 times
6.
Turn the Back Focus locking screw in the
clockwise direction and ensure that it is
securely fastened.
Back Focus Adjustment
Back Focus adjustment ring
Back Focus locking
screw (M2.6)
Lens focus ring
Tighten
Loosen
VN-C20_EN.book Page 19 Tuesday, January 31, 2006 1:51 PM