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focuses the image
Film (set pt.) -
|Since the f-stop and shutter speed work by halving or doubling their values, then a movement in one can be balanced by the same but opposite movement of the other.
If 1/250 of a second @ f-2.8 is the correct exposure then,
1/15 of a second @ f-11 will provide the same overall exposure.
The image will be different, but the exposure will be the same.