I taught photography at the Zurich School of Design for over three decades. During this time, many textbooks on the basics, theory and practice of photography emerged, textbooks that have become standard works and have been translated into many languages.
I prefer to use a simple pinhole camera to explain the basic imaging principle in photography to my students. With such, many optical laws can be demonstrated without technical distraction; for example, the linear propagation of light, the principles of focal length, image width, image size, imaging scale, perspective and proportions, but also terms such as and field angle. Today, it is easier and, above all, more time-saving: to make the presentations in the larger auditorium during a lecture without delaying laboratory work, I use a digital SLR camera with an intermediate ring set or bellows device and a housing cover with a precision hole. This has the advantage that this pinhole camera is operated via the laptop and both settings and the respective result appear directly on the monitor and connected projector. Although the didactic application of the pinhole camera serves primarily as a tool for theoretical explanations of com
