Reciprocity

You now have the ability and understanding to create a variety of effects using various combinations of aperture and shutter speed. You know that aperture controls depth of field (shallow or deep) and shutter speed controls motion (frozen or blurred). Each exposure has about seven combinations of apertures and shutter speeds that will give you 18% gray, you need to make a conscious determination about the effect you want. You'll see in these guitar pictures that the same scene has been shot with different combinations of aperture and shutter speed... each exposure is accurate, yet each gives a different effect. You can do the same with each subject that you shoot. In fact, it's a good idea to try two or three different (slow) shutter speeds when blurring motion, and two or three different apertures when trying to control depth of field.