Handheld

Handheld is when the camera operator is using the camera in his own hands, instead of on a tripod or a gimbal.

Hydrargyrum medium-arc iodide (HMI)

The trademark name of Osram’s brand of metal-halide gas discharge medium arc-length lamp, made specifically for film and entertainment applications. Hydrargyrum comes from the Latin name for the element mercury. The light temperature is daylight.