Castillo de San Cristóbal Sunset Photo Metadata Caption: A day in Old San Juan, Puerto RicoWhen: Oct 19, 2013 05:49:29 pmCamera: Canon EOS 7DFocal Length: 50mmISO: 500Aperture: f/13Shutter Speed: 1/640secRights : cc licensed ( BY-SA ) photo by Alan Levine