Zoom

The FCB camera employs an 18⋅ optical zoom lens combined with a digital zoom function allowing you to zoom up to 216⋅.

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 216⋅ 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 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.

Basic Functions

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.

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.

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.

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