Thanks for your interest in chang dae hi-tech. Chang dae hi-tech focused on manufacturing high precision optical components. Currently we are concentrating in manufacturing tir prism ass''y products including prism and optical ass''y lens module unit for dlp engine, mirror, quartz, filter. Our job is, quite simply, to provide you with the components you need for research, development or in the manufacture of your products. C. D. H. Is a high precision optical co, which provides worldwide service for any and all of your requirements. We pride ourselves in the repeatability of our processes and our reputation for on-time delivery. Large quantities are not a problem. Look through this catalog to see the products we manufacture. E-mail or call us with your request and we will confirm the price and delivery a short period of time. If you are not completely sure what you need - just contact us and one of our engineers will be pleased to assist you with your selection. We hope you will give c. D. H. A chance to be your optics supplier and to show you that we can deliver the quality and service that you expect.