I would like to see the difference between Fraunhofer and Fresnel diffraction with a homemade setup. Has anyone achieved this? In this example, it seems that the main components are a He-Ne laser, a short-focal lens, a pinhole and an adjustable aperture. I have some doubts about the possible alternative materials. Would a common laser pointer have the same effect? What lens should I need? What pinhole do you recommend? I've seen that the optimum size is around 0.1-1 mm. Thanks.