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The iris is a metal frame housing designed with an adjustable shutter assembly (an iris). The iris is placed inside fixtures through a specifically designed opening, the accessory (or iris) slot. The iris is placed inside focal plane of fixture, before the lens assembly. An iris is designed to reduce diameter of beam emitted from fixture.
Type of louver in concept Louver used in a Stevenson screen Louver shutters in Italy Louvered cupola bell house. A louver (American English) or louvre (Commonwealth English; see spelling differences) is a window blind or shutter with horizontal slats that are angled to admit light and air, but to keep out rain and direct sunshine. The angle of ...
A pair of CrystalEyes shutter glasses Functional principle of active shutter 3D systems. An active shutter 3D system (a.k.a. alternate frame sequencing, alternate image, AI, alternating field, field sequential or eclipse method) is a technique for displaying stereoscopic 3D images. It works by only presenting the image intended for the left eye ...
Shutters are usually installed into the frame of a window and consist of louvers, often made of either wood or a synthetic resin, that may be fixed or moveable. They do not move out of view like blinds but in certain applications can fold across the window. Various window blind styles
Window shutter hardware, usually made of iron, are hinges and latches that attach to the shutter and a window frame (and in some cases directly attached to stone or brick). The hinges hold the shutter to the structure and allow the shutter to open and close over the window. The latches secure the shutter in the closed (over the window) position.
ERS or profile lanterns have many useful features. One of the most useful are the metal shutters at the focal plane of the lens to shape the beam of light. The original shape of the beam is round, but with the use of the shutters one can limit the beam to avoid obstacles or parts of the set that should not be illuminated in a specific look.