Prof. Jörg-Dietrich Hoppe in 2004
<a href="//commons.wikimedia.org/wiki/User:T%C3%BArelio" title="User:Túrelio">Túrelio</a>
CC BY-SA 3.0 de
<span class="int-own-work" lang="en">Own work</span> (digitized from <a href="https://en.wikipedia.org/wiki/135_film" class="extiw" title="en:135 film">35 mm</a> <a href="https://en.wikipedia.org/wiki/Photographic_film" class="extiw" title="en:Photographic film">photographic color film</a>)