7
Basic Functions
Basic Functions
Zoom
The FCB camera employs an 18
×
optical zoom lens
combined with a digital zoom function allowing you to
zoom up to 12
×
.
Lens specifications: Optical 18
×
, f = 4.1 to 73.8 mm
(F1.4 to F3.0)
The horizontal angle of view is approximately 48
degrees (wide end) to 2.8 degrees (tele end).
Digital Zoom enlarges the center of the subject by
expanding each image in both the vertical and
horizontal directions. When 12
×
zoom is used, the
number of effective picture elements in each direction
reduces to
1
/
12
and the overall resolution deteriorates.
You can activate the zoom in the following two ways:
• By pressing the TELE or WIDE buttons 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 (extreme close-up settings with VISCA
control) and 800 mm at the optical tele end (distance
from the front end of the lens), 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 or the
WIDE buttons, 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.
