Your times are definitely too long. The mixing chambers were still sold new not so long ago bu Fotoimpex in Berlin. Is this what you mean? http://www.fotoimpex.de/cgi-bin/shop...otolabor&range ub2=Vergr%F6%DFerer%2DZubeh%F6r&vendor=Meopta&pn=1 2&sort=0&items=