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Message: <blockquote data-quote="Eye-level" data-source="post: 119851" data-attributes="member: 6548"><p>With aperture the wider you open it and the more distance between your subject and the background you are going to get a stronger blur effect.  Sometimes you'll want to stop down a lens though so that all of the picture is in focus - stopping down will increase your depth of field. ISO is an international standard for rating speed just as ASA was the international standard for rating the speed of film back in the day.  DIN was like the original German version of rating film speed.  In daylight you want to use a low ISO (always use the lowest ISO possible to get the shot) in the dark you want to use a higher ISO.  Newer cameras tend to have really good high ISO performance.</p></blockquote><p></p>