He explicitly does: > That last number might be twice as large in the dimmest of light or half as large in bright light; and the blurriness from being out of f

He explicitly does: > That last number might be twice as large in the dimmest of light or half as large in bright light; and the blurriness from being out of focus scales in direct proportion to it. So if you’re shooting in full daylight, you might have only half as much blurriness as shown in the following images. But your enemies may not do you the courtesy of attacking in full daylight.