Okay, so I know my way around aperture, shutter speed, and film speed (ISO) well enough for stills photography. What I can't seem to wrap my brain around is what effect changing the shutter speed has while recording video. Aperture and ISO make sense, but how does shutter speed come into play? And how does it relate to the fps setting of the selected video mode (e.g., 24fps, 30fps, 60fps)? If someone could explain in simple language, that would be great. Thanks!