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| Re: size of grid for spot behind portrait |
I would go with getting a set, and which one you use will not only depend on size, but also on what shape you want. Unless it is actually positioned behind the subject, the closer it is the more elliptical or oval the spot will be, because of the angle it will have to be positioned in to keep it out of the frame.
I have used a shoot with a 10º grid for this.