American Dynamics ADC860, Инструкция по эксплуатации

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Lens (continued)
• After completing connections as shown in “Connection” on page
13, supply power to the camera, display a picture on the monitor
and check the image.
Auto-iris lenses have generally been adjusted for the widest ap-
plicability before shipment, but readjustment may sometimes
be necessary depending on the conditions of the objects to be
shot and the lens combination. If the picture recorded using such
a lens looks unnatural, readjust as shown below.
• Auto-iris lens with built-in EE amp
L N
Av P
k
ALC LEVEL
BF LOOK
Monitor screen
To darken picture
To brighten picture
LEVEL turning direction
Counterclockwise (toward L)
Clockwise (toward H)
ALC adjustment
This cannot be adjusted on the lens. The ALC should
be adjusted as described in “Av : Pk [Average value :
Peak Value]” on Page 11.
LEVELadjustment
• Auto-iris lens without EE amp
Re-adjust as descried in “IRIS [Iris level]” on page 8.
Caution
Do not turn the LEVEL control too far towards “L” as this could
cause the AGC of the camera to increase the gain, making the
picture look rough.
䡵
Backfocus adjustment
The backfocus has been adjusted before shipment so that the widest range
can be obtained with C-mount lenses, but readjustment is necessary when
the lens mount is switched to the CS mount or a combination lens is used.
When necessary, readjust the backfocus by the following procedure.
1.
Loosen the BF LOCK screw by turning
it counterclockwise with a screwdriver.
2.
Optimize the focus by turning the
backfocus adjustment ring.
3.
Lock the BF LOCK screw by turning it
clockwise.
<When a fixed – focus lens is used>
Readjust the backfocus when the optimum focusing cannot be obtained
by adjusting the focusing ring of the lens.
<When a zoom lens is used>
Readjust the backfocus when focusing is lost during zooming (from wide angle
to telephoto).
1.
Loosen the BF LOCK screw by turning it counterclockwise with a
screwdriver.
2.
Shoot a fine pattern of as dark as possible an object at a distance of
more than 3 meters.
3.
Set the zoom for telephoto and adjust the focus with the lens’s fo-
cusing ring.
4.
Set the zoom for wide angle and adjust the focus by turning the backfocus
adjustment ring. (Refer to “When a fixed-focus lens is used” above.)
• Repeat steps 3 and 4 a few times.
5.
Lock the BF LOCK screw by turning it clockwise.
Backfocus adjustment
ring
BF LOCK
(backfocus look) ring
15