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7
Basic Functions
Zoom
The FCB camera employs an 18× optical zoom lens.
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).
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.
In these standard and variable Speed Modes, it is necessary
to send a “Stop Command” to stop the zoom operation.
Focus
Focus has the following modes, all of which can be set
using VISCA Commands.
• Auto Focus Mode
The minimum focus distance is 290 mm at the optical
wide end 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 Normal or LOW.
- Normal
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.
• 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.
In these standard and variable Speed Modes, it is necessary to
send a “Stop Command” to stop the zoom operation.
• 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).
The focus range is narrowed by excluding the
unnecessary range.