What refers to a metal plate with a center hole that can be inserted into lanterns to sharpen focus?

The term "Donut" refers specifically to a metal plate with a center hole that is used in lighting fixtures, particularly in theatrical lanterns, to help sharpen the focus of the light beam. The design of the donut allows it to fit tightly inside the lantern while also creating a defined aperture at the center from which light can project. This setup can enhance the focus of the light, making it more precise and controlled in its distribution.

Understanding how a donut works in conjunction with a lighting fixture is essential for achieving the desired effects on stage. By adjusting the position and the lens of the lantern in relation to the donut, lighting designers can create various visual effects that are critical for performances. This piece of equipment is particularly valuable for achieving crisp edge focus or highlighting specific areas on stage without spill light that would detract from the intended visual composition.

In comparison, other options refer to different elements of stage lighting or production. A douser typically refers to a mechanism that can block light, DLC might denote a specific type of lighting control, and Cue Light signifies a signaling system used to communicate cues. Understanding these distinctions is important for anyone involved in theatre production and design.