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6
Basic Functions
Zoom
The FCB series camera employs an 10× optical zoom
lens combined with a digital zoom function allowing
you to zoom up to 40×.
Lens specifications: Optical 10×, f = 4.2 to 42 mm
(F1.8 to F2.9)
The horizontal angle of view is approximately 46
degrees (wide end) to 4.6 degrees (tele end).
Digital Zoom enlarges the center of the subject by
expanding each image in both the vertical and
horizontal directions. When 40× zoom is used, the
number of effective picture elements in each direction
reduces to
1
/4 and the overall resolution deteriorates.
You can activate the zoom in the following two ways:
•By pressing the TELE or WIDE button on the
camera itself.
•Using a VISCA Command
Using Standard Mode
Using Variable Mode
There are eight levels of zoom speed.
Direct Mode
Setting the zoom position enables quick
movement to the designated position.
Digital Zoom ON/OFF
In these standard and variable Speed Modes, it is necessary
to send a “Stop Command” to stop the zoom operation.
• The Zoom Mode supports a Combined Mode and a
Separate Mode.
Combined Mode
This is the previously existing zoom method.
After the optical zoom has reached its maximum
level, the camera switches to Digital Zoom Mode.
Separate Mode
In this mode, Optical Zoom and Digital Zoom can
be operated separately. You can use digital zoom
magnification at any time from within any level of
optical magnification.
Focus
Focus has the following modes, all of which can be set
using VISCA Commands.
• Auto Focus Mode
The minimum focus distance is 10 mm at the optical
wide end and 1000 mm at the optical tele end, and is
independent of the digital zoom.
The AutoFocus (AF) function automatically adjusts
the focus position to maximize the high frequency
content of the picture in a center measurement area,
taking into consideration the high luminance and
strong contrast components.
- Normal AF Mode
This is the normal mode for AF operations.
- Interval AF Mode
The mode used for AF movements carried out at
defined intervals. The time intervals for AF
movements and for the timing of the stops can be
set in one-second increments using the Set Time
Command. The initial value for both is set to five
seconds.
- Zoom Trigger Mode
When the zoom is changed with the TELE button,
WIDE button, VISCA Zoom commands or key
switches, the pre-set value (initially set at 5
seconds) becomes that for AF Mode. Then, it
returns to Manual Focus mode.
AF sensitivity can be set to either HIGH or LOW.
- HIGH
Reaches the highest focus speed quickly. Use this
when shooting a subject that moves frequently.
Usually, this is the most appropriate mode.
- LOW
Improves the stability of the focus. When the
lighting level is low, the AF function does not take
effect, even though the brightness varies,
contributing to a stable image.
When used for 24 hours continuously,
initialization of lens system once a day is
recommended because this will make the life of
lens longer. The Initialize Lens Command takes a
little less than 3 seconds to initialize the focus and
zoom.
• Manual Focus Mode
Manual Focus has both a Standard Speed Mode and a
Variable Speed Mode. Standard Speed Mode focuses
at a fixed rate of speed. Variable Speed Mode has
eight speed levels that can be set using a VISCA
Command.
• One Push Trigger Mode
When a Trigger Command is received, the lens
moves to adjust the focus for the subject. The focus
lens then holds the same position until the next
Trigger Command is input.
• Infinity Mode
The lens is forcibly moved to a position suitable for
an unlimited distance.
• Near Limit Mode
Can be set in a range from 1000 (∞) to C000 (10 mm).