A commomerative plaque marks the spot in Wetzlar where Oskar Barnack tested his Ur-Leica in this modern view (2018).
<a href="//commons.wikimedia.org/w/index.php?title=User:Aljawad&amp;action=edit&amp;redlink=1" class="new" title="User:Aljawad (page does not exist)">Aljawad</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>