A pipe holder includes a body member and a support member connected to and extending away from the body member. A plurality of semiconductor pillars extending outwardly from a bulk section of a semiconductor substrate is arranged in rows and columns. 70 and an Abbe’s number of not less than 50 with an optimized incident and emergent configuration in order to satisfactorily correct aberration with a enhanced focusing performance even with a shortened focal distance. The sender time is indicated as an NTP timestamp in RTCP sender reports.