My light source was the sun shining through the window. I use a piece of panelling that is painted black. However, if the light does shine on the board, the background becomes grey. It takes a bit of manipulating but I try to have the board in the shadows while the sun or bright light is on the subject. That allows the background to stay black. Sometimes I use Ross's suggestion of having the black board far enough from the subject that the board is out of focus and stays black. Ideally, if the light is from more-or-less above or at least a high angle, I place the board between the light source and the subject. That way the board is in it's own shadow and stays very black. It is easiest for me to do that outdoors in summer when the sun is high....trickier in the winter when the sun is low.
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