Rosco  •  Visual Departures

By: Visual Departures  09-12-2011

Rosco  •  Visual Departures

Add Emotion and Visual Interest to a Scene

Any great set designer will tell you that when lighting a scene, the lights you use are only part of the equation. Like any great art, what you leave out is just as important as what you put in. Enter: gobos. Derived from the phrase "GOes Before Optics", gobos fit between your light source and lens to partly obscure or modulate light.

Types of Gobos

Depending on what they're used for, gobos may be made of stainless steel or glass. Stainless steel gobos selectively block light, often creating a stippled effect or more or less expressionistic shapes. Glass gobos come in a variety of forms: Colorizers create beautiful multi-colored effects. Image Glass gobos are colorless, bending and refracting light to create complexity. Prismatics are usually fitted into moving lights and project kaleidoscopic patterns. ColorWaves create vivid dichroic color patterns such as waves and mosaics. Different gobos can be used on each light and mixed on-stage to liven things up.

Gobo Sizes

It's important to understand that gobos come in a variety of sizes. Depending on the lamp you use, you will want compatible gobos and at least one compatible gobo holder.

Standard Gobo Sizes (Measurements in millimeters)
Letter Size Outer
A Size 100 75
B Size 86 64.5
M Size 66 48
E Size 37.5 28
BG Size 79 64.5 Obsolete glass size. Available by special order.
C Size 150 120 C Size available size by special order.
G Size 65.5 48 For Clay Paky Goldenscans
D Size 53.3 38
Cyberlight 44.25 38
Studio Spot 575 36.3 31 For HES Studio Spot 575
Mac 500/918 27.5 22 Not all standard designs available in this size.
V Size 25.5 22 Not all standard designs available in this size.
Mac 250 22.5 17 Not all standard designs available in this size.
518 Size 20 13 Not all standard designs available in this size.

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