Gridspot (or grid) is a studio accessory that you can attach to your flash. When the flash fires through the grid, the spread of the light rays is limited. The effect you get is very similar to the effect achieved by a snoot, but light more controlled and really hits a small surface. You often want to use a snoot or a grid for avoiding light spillage when you are setting up you back light.

Here is what you’ll need:

- Some black coroplast (you can get it in art stores and office depot)
- An exacto knife
- Glue

The first step is to measure your flash head. I use a Nikon SB800 which is six centimeters wide. Then, using the exacto knife, cut the coroplast into pieces of six by three. (If your flash is wider cut to something else by three cm). I did this by cutting a long six centimeters strip of coroplast, then trimming 3 centimeters at a time.
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