Object Distance (Subject Distance).

As the name implies, refers to material from the camera lens and the subject is the distance between. .The change will make things from the perspective effect change. .In the same aperture settings, object distance change will affect the depth of field photos. .As the name implies, refers to material from the camera lens and the subject is the distance between. .The change will make things from the perspective effect change. .In the same aperture settings, object distance change will affect the depth of field photos..