A gobo projector is a stencil or template placed inside or in front of a light source to regulate the shape of the emitted light. Lighting designers typically make use of them with stage lighting instruments to manipulate the shape of the light cast over a space or object-for example to produce a pattern of leaves on a stage floor. Sources
The term “gobo” has arrived to sometimes reference any device that produces patterns of light and shadow, and various pieces of equipment that go before a light (like a gobo arm or gobo head). In theatrical lighting, however, the term more specifically refers to a product placed in ‘the gate’ or in the ‘point of focus’ between the light source and the lenses (or some other optics). This placement is essential as it creates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed following the optics do not generate a finely focused image, and are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It really is cited by some lighting professionals as “goes before optics” or, less often, “goes between optics”. An alternate explanation is “graphical optical black out.” The phrase is traced returning to the 1930s, and originated in reference to some screen or sheet of sound-absorbent material for shielding a microphone from sounds coming from a particular direction, without application to optics. The management of the term as an acronym is recent and ignores the initial definition in favour of popular invention. There are many online types of acoustic gobos. The word probably is actually a derivative of “goes between.”
A gobo light projector from the Earth, projected employing a halogen projector. Gobos are employed with projectors and simpler light sources to generate lighting scenes in theatrical applications. Simple gobos, integrated into automated lighting systems, are popular at nightclubs as well as other musical venues to generate moving shapes.Gobos may also be used for architectural lighting, as well as in interior decorating, like projecting a company logo on the wall.
Gobos are created from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos utilize a metal template from where the image is eliminate. These are the basic most sturdy, but often require modifications towards the original design-called bridging-to display correctly. To correctly represent the letter “O” as an example, requires small tabs or bridges to aid the opaque center from the letter. These may be visible within the projected image, which can be undesirable in some applications.
Glass gobos are produced from clear glass with a partial mirror coating to bar the light and provide “black” areas inside the projected image. This eliminates any need for bridging and accommodates more intricate images. Glass gobos can also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for each and every color) glued with an aluminium or chrome coated black and white gobo, or by newer technologies that vary the thickness in the dichroic coating (and therefore the colour) in a controlled way on a single part of glass-which makes it possible to turn one photo into a glass gobo. Glass gobos generally provide you with the highest image fidelity, but are by far the most fragile. Glass gobos are generally created with laser ablation or photo etching.
Plastic gobos or Transparency gobos can be used in LED ellipsoidal spotlights. These “LED Only” plastic gobos can be full color (such as a glass gobo), however are less delicate. These are a new comer to the market, as well as Leds, along with their durability and effectiveness vary between brands.
Before, plastic gobos were generally tailor made for when a pattern requires color and glass does not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main objective point position of the gobo is incredibly hot, so these thin plastic films require special cooling elements to avoid melting. A lapse inside the cooling apparatus, for seconds, can ruin a plastic a gobo in a tungsten-halogen lighting instrument.
Patterns – Theatrical and photographic supply companies manufacture many basic and complex stock patterns. Additionally they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from a manufacturer’s catalog. Due to the great number of gobos available, they are generally known as by number, not name. Lighting technicians can also hand cut custom gobos away from sheet metal stock, or perhaps aluminum pie tins.
Gobos are often used in weddings and corporate events. They are able to project company logos, the couple’s names, or just about any artwork. Some companies can turn gobo light within per week. Designers rxziif use “stock” gobo patterns for these events-for instance for projecting stars or leaves onto the ceiling.
The term “gobo” also is used to describe black panels of different sizes or shapes placed between a source of light and photographic subject (including between sun light as well as a portrait model) to control the modeling effect from the existing light. It will be the opposite of a photographer using a “reflector” to redirect light into a shadow, that is “additive” lighting and a lot commonly used. Use of a gobo subtracts light coming from a percentage of an overall shaded subject and creates a contrast between one side of the face and another. It allows the photographer to expose with wider open apertures giving soft natural transitions between the sharp subject and unsharp background, called bokeh.