Most SLRs, even entry-level ones, have a remote shutter release socket so
you can shoot pictures without actually touching the camera body.The
remote trigger is used often in long-exposure photography, where even a
small amount of vibration can introduce blurriness into the image. As
steady as your hands are, they are not machines, and, therefore, they are
prone to tiny movements that you may not be aware of until you view your
picture.With a wired remote trigger release, the camera body can be
mounted on a tripod, and you operate the camera through the wired
remote trigger.
