A custom gobo 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 utilize them with stage lighting instruments to manage the shape of the light cast over a space or object-as an example to make a pattern of leaves on a stage floor. Sources
The word “gobo” has come to sometimes reference any device that produces patterns of light and shadow, and other pieces of equipment that go before a mild (like a gobo arm or gobo head). In theatrical lighting, however, the term specifically refers to a product placed in ‘the gate’ or in the ‘point of focus’ in between the light source and the lenses (or some other optics). This placement is important as it creates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed right after the optics usually do not generate a finely focused image, and therefore are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It is cited by some lighting professionals as “goes before optics” or, more infrequently, “goes between optics”. An alternative explanation is “graphical optical black out.” The term is traced to the 1930s, and originated in reference to your screen or sheet of sound-absorbent material for shielding a microphone from sounds originating from a specific direction, without application to optics. The treatment of the phrase as being an acronym is recent and ignores the first definition in favor of popular invention. There are numerous online types of acoustic gobos. The term probably is really a derivative of “goes between.”
A gobo light projector in the Earth, projected using a halogen projector. Gobos are used with projectors and simpler light sources to create lighting scenes in theatrical applications. Simple gobos, included in automated lighting systems, are popular at nightclubs and other musical venues to generate moving shapes.Gobos could also be used for architectural lighting, along with home design, as in projecting a business logo over a wall.
Gobos are created from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos make use of a metal template that the photo is cut out. 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” for instance, requires small tabs or bridges to support the opaque center in the letter. These can be visible within the projected image, which can be undesirable in a few applications.
Glass gobos are made of clear glass having a partial mirror coating to block the sunshine and create “black” areas within the projected image. This eliminates any necessity for bridging and accommodates more intricate images. Glass gobos may also include colored areas (just like stained glass windows), whether by multiple layers of dichroic glass (one for each and every color) glued on an aluminium or chrome coated white and black gobo, or by newer technologies that vary the thickness of the dichroic coating (and for that reason colour) in a controlled way on one bit 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 they are by far the most fragile. Glass gobos are generally designed with laser ablation or photo etching.
Plastic gobos or Transparency gobos can be utilized in LED ellipsoidal spotlights. These “LED Only” plastic gobos may be full color (like a glass gobo), but are much less delicate. These are new to the current market, much like LED lights, as well as their durability and effectiveness vary between brands.
Before, plastic gobos were generally tailor made for when a pattern requires color and glass will not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main objective point position of the gobo is very hot, so these thin plastic films require special cooling elements to prevent 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. They also can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern from a manufacturer’s catalog. As a result of great number of gobos available, they are generally referred to by number, not name. Lighting technicians could also hand cut custom gobos away from sheet metal stock, or even aluminum pie tins.
Gobos tend to be utilized in weddings and corporate events. They could project company logos, the couple’s names, or virtually any artwork. Some companies can turn gobo light within a week. Designers rxziif use “stock” gobo patterns for these events-as an example for projecting stars or leaves onto the ceiling.
The phrase “gobo” also is used to describe black panels of different sizes or shapes placed from a source of light and photographic subject (like between sun light as well as a portrait model) to regulate the modeling effect from the existing light. This is the complete opposite of a photographer utilizing a “reflector” to redirect light in to a shadow, which can be “additive” lighting and most frequently used. Use of a gobo subtracts light coming from a part of an overall shaded subject and produces a contrast between one side of the face and the other. It allows the photographer to show with wider open apertures giving soft natural transitions involving the sharp subject and unsharp background, called bokeh.