A gridspot is a light modifier kind of like a snoot or barndoors that gives you a tightly focused beam instead of spreading light all over the place. It kind of gives you a spot light effect. A grid is just that, a grid of openings of a certain size that restricts the light into a particular field of angles. The tighter the grid, the more restricted the beam of light. A snoot works similarly, expect that you increase it's length to tighten the beam. A grid is more compact. A snoot can be made out of anything stiff like cereal boxes, your hand, aluminum foil, etc.
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