Here is one of the - normally hidden - VELVET projectors now employed at http://www.planetarium-bochum.de (where the first regular show will commence in 20 minutes). The optics are unique and employ exotic glass types and grinding techniques.

Here is one of the - normally hidden - VELVET projectors now employed at http://www.planetarium-bochum.de (where the first regular show will commence in 20 minutes). The optics are unique and employ exotic glass types and grinding techniques.