pinhole adapter for M43 camera

This adapter allows you to attach a pinhole to an M43 mount camera.
The focal length is 19mm (38mm equivalent in 24x36). The optimal hole diameter is 0.17mm (0.15mm and 0.20mm are available as standard).
You can make it yourself by drilling a piece of aluminum with a diameter of 20mm cut in a can, there are many tutorials available on the web. It is also possible to buy them, e.g. on the Reality so subtle (https://realitysosubtle.fr/custom-cameras/laser-drilled-pinholes/) website.