Hangzhou MDK Opto Electronics (杭州美迪凱光電科技股份有限公司, also known as MDK) is a company engaged in the research, manufacturing, and sales of optoelectronics and optical semiconductor products. It offers optical sensor package substrates and connectors, security camera filter assemblies, colored glass optical coating films, etc. The company specializes in digital cameras, projectors, machine vision, security monitoring, and other fields.