I know that shutter speed can freeze or blur motion. Aperture affects depth of field. Besides that, are there any ways that shutter speed or aperture can affect the "look" of an image? Like, why you would choose to control the amount of light with one or the other? I'm thinking in terms of... contrast, dynamic range, etc. I tend to adjust the iris according to what kind of depth of field I want, and then control the brightness with shutter (and of course ISO to a lesser degree). I just want to make sure I'm not missing out on anything by doing it this way.