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.
