What it is a perforated lens certainly does not need to be mentioned here. Or is it? Well, such a hole lens has only a tiny hole instead of a lens through which exposure is made. It refracts the light like a lens and creates an image on the sensor. The only requirement is that the respective camera must have a possibility for long exposure. A tripod is of course essential without blurring the picture. In the reflex viewfinder at f / 166 and bright light, the image is still vague in the reflex viewfinder, otherwise it means: aim, use a camera with an optical viewfinder or a clip-on viewfinder.
