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Term - O

Optical Speed :

Lens speed, expressed by f-number. Smaller f-number means faster lens.

Optical Axis :

Optical centerline that passes through the center of a lens or mirror, etc.

OSD (On Screen Display) :

A method of displaying set-up information and/or instructions on a display monitor.

Online Help :

A reference program within most software programs that provides basic descriptions and instructions on how to use that software program.

OR Gate :

A logic circuit that requires that any input must be in a high state (logic 1) to generate a high state output (logic 1).

Output Relay :

A device that changes its state upon receiving a signal from a controller. Typically the state change prompts an action outside of the controller such as activating or inactivating a device.

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