How sharp is that gobo? Isn't that something like asking how long is a piece of string? The answer to both these questions would appear to be highly subjective. Take a gobo and project it from a luminaire, and we all have our opinions about how sharp the projected image is. What's more, when viewing two fixtures side-by-side, we can usually agree on which one gives the better result. However, until now, we have had no way to either communicate or document that sharpness in numbers or to be ...

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