View of the Experimental Hall and the storage ring (Credit: ESRF/Stef Candé) View of the Experimental Hall and the storage ring (Credit: ESRF/Stef Candé) Technical Details Camera: Canon EOS 5D Mark IV Taken: 21 Dec 2016 Focal length: 24mm Aperture: f/45 Exposure: 1/8 second ISO: 1600