It happens when you inadvertently move your camera when you press the shutter button. This is harder to stop than what most photographers believe. It actually takes a good deal of practice to steady your hand so that you don’t shake it when pressing the shutter button. Even the slightest camera shake can create distortions in the image or reduce its sharpness. So this is something you should master from the very beginning.
It’s vital to get yourself in the habit of always checking your camera settings before you go from one shot to the next. So many times in the annals of photography, people have found out, much to their chagrin, that their perfect picture-taking opportunity was absolutely ruined by camera settings that were totally out of whack.
We have been seeing a lot of "back to basics" articles...and this one is no different. It even touches upon some issues that are easily left out. Like, remembering to reset those camera settings and having charged and extra batteries on your person. Tip: During the winter, place the batteries in an inside pocket of your coat to keep them lasting longer, the cold extracts the energy, to where they will not last as long.