| Word | Description |
| Galvanometric (galvometric) | One method of converting the small electric currents produced by Auto Iris circuits into physical movement of the iris diaphragm. Used in both Auto Iris and Direct Drive lenses. |
| Gamma | A camera adjustment that ensures a linear correlation of light gain on the entire system eg. A doubling of light input gives double light output. |
| Gateway | A computerised device that performs protocol conversation between different types of networks or applications. |
| Gen. Lock (see ext. sync) | To synchronize one piece of equipment to the sync pulses of another. |
| Gigabit Ethernet | Technology that adapts the Ethernet model for data transmission at 1 Gbps or higher. |
| Ground Loop | An unwanted continuous or temporary ground current flowing back and forth between two devices that are at different ground potentials. |