6
Basic Functions
Zoom
The EX780S/SP uses an 25
×
optical zoom lens. And
its digital zoom function allows you to zoom up to
300
×
.
• Optical 25
×
, f = 2.4 to 60 mm (F 1.6 to F 2.7)
The horizontal angle of view is approximately 45
degrees (wide end) to 2.0 degrees (tele end).
Digital Zoom enlarges the center of the subject by
expanding each image in both the vertical and
horizontal directions. When 300
×
zoom is used, each
effective picture element deteriorates to 1/16 of normal
resolution 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 Standard and Variable Speed Modes, the Command itself
allows for no levels of change. If you want to change the
zoom in steps, you must use the Stop Command.
• 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
1)
The minimum focus distance is 35 mm at the optical
wide end and 800 mm at the optical tele end, and is
independent of the digital zoom.
The AutoFocus (AF) function automatically adjusts
the focus position to maximise 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
particular 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
stops.
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.
1) When used for 24 hours continuously, initialization of lens
system at regular intervals is recommended because external
factors result in a larger position-detection error.
The Initialize Lens Command takes a little less than 3 seconds to
initialize the focus and lenses.
• 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 sent, the lens moves to
adjust the focus for the subject. The focus lens then
holds that 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 (35 mm).
