condesor consisting of a spheric mirror, which images the incandescent lamp filament beside in itself, an aspheric condenser lens and optionally a heat protection filter plate.
<a href="//commons.wikimedia.org/wiki/User:Ulfbastel" title="User:Ulfbastel">Ulfbastel</a>
<span class="int-own-work" lang="en">Own work</span>