An apparatus for creating a digital photo album is disclosed. The method including the step of determining whether any two given objects have opposing directionalities. The systems and methods described herein enable lower-power, smaller form-factor designs as well as very high-speed operation. The media server selects the content rate from among a plurality of supported content rates in response to the proxy-to-server feedback message from the proxy server, and streams streaming multimedia frames to the client at the selected content rate. Each lens constituting the front group and the rear group is a single lens.