Thanks to a number of people that have give me material, foto's or info .

In random order:

J.P Hayon - vintagescope .

Bronkie                          
Yaroslav                         
Herbert                           
Rick Appleby-Bowles         
David Bijoux                    
Fabien Le Paillier              

Paul Philipp Pöllinger

Henrik K. Henriksen
Per Rishoej
Jean Marc Tilly
Michael Orskog
J.W. Dean
Danny Scanloni
Martin Radda
Kerry Miller
Philip Stout