<http://digiphoto.techbang.com/posts/9472-nikon-launches-three-new-mirrors-fisheye-zoom-8-15mm-wide-angle-large-aperture-28mm-f14-and-dx-ultra-wide-angle-10-20mm>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://digiphoto.techbang.com/posts/9472-nikon-launches-three-new-mirrors-fisheye-zoom-8-15mm-wide-angle-large-aperture-28mm-f14-and-dx-ultra-wide-angle-10-20mm>