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Message: <blockquote data-quote="hark" data-source="post: 302367" data-attributes="member: 13196">Making the best use of the lens you own for this situation, you want to use its largest aperture at the 55mm end. That means the aperture will be f/5.6. There is a physical difference in the diameter of the aperture when comparing it at 18mm vs. 55mm, and the diameter of the aperture affects DOF (especially when used in conjunction of being close to the subject and having distance between the subject and its background). So get as close to your subject as possible while distancing the subject from the background as possible, and shoot at f/5.6.EDIT: Let me add that when I say get as close to your subject as possible, that doesn't mean at the closest focusing distance. You don't want to create distortion so you want to be close enough without distorting the features of your subject.</blockquote>