Depth of field is all about what is clearly visible in the photo and what is blurred in the photo. To be able to change your depth of field you need to change the shutter speed, and the aperture size. This will allow you to be able to keep either a certain subject in focus or all subjects in focus. when changing these you may have to change the ISO as where you are changing the size of the aperture it is going to make the subject either lighter or darker and the ISO will help you with making the lighting just right.
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