How Sharp Is That Gobo?

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

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