You've seen the photos, the ones that have the subject in the foreground that really stands out and your eye goes to the sharpest point of the image, this is called "shallow depth of field". This can be created easily using your camera that has aperture control. A shallow depth of field is a subject in focus and the background blurry. You can also reverse it like the photo below of the speaker. With that said here are some tips to make it happen.
Put distance between the subject and the background
The size of your aperture is what changes the depth of field. So the larger the opening for each, the smaller your subject is focused. Lower aperture numbers like f/2 to 4 works the best.
Long lenses are great for subjective focusing and can really bring out the subject. Using lower aperture numbers are still highly suggested but you can get away up to 5.6 depending the distance from the subject. So remember zoom lenses in the range starting at 100 and up are the best. The photo below of Diana Nyad is a great example. Notice the crowd blurred. Your eyes are drawn to Diana. Also look at the photo of the man. The focal length was around 300mm.
The photos were taken at the beautiful JW Marriott San Antonio Hill Country Resort & Spa
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