<https://leica-camera.com/es-MX/photography/lenses/m/summilux-m-28mm-f1-4-asph-black>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://leica-camera.com/es-MX/photography/lenses/m/summilux-m-28mm-f1-4-asph-black/datos-tecnicos>