If you have a large the depth of field then you have to decrease the aperture by increasing the number but must compensate the shutter speed by increasing the speed. If you have a short the depth of field you have to increase the aperture by decreasing the number and decreasing the shutter speed. This picture has a short depth of field since the background is blurry. To enhance the background you would need to decrease the aperture by increasing the number and increasing the speed.
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