SPIE Proceedings [SPIE Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016) - Suzhou, China (Tuesday 26 April 2016)] 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems; and Smart Structures and Materials - Novel design of focal length adjusting apparatus with long journey