The code used to generate these images is available
here
.
The spheres are the same size. There is no motion in the scene.
Aperature: 0 (pinhole) d: 5.0
Aperature: 0.5 d: 2.5
Aperature: 0.25 d: 2.5
Aperature: 0.5 d: 5.0
Aperature: 0.25 d: 5.0
Aperature: 0.5 d: 7.5
Aperature: 0.25 d: 7.5