The filter thread size of Olympus M.Zuiko Digital ED 14-42mm F3.5-5.6 EZ is 37mm.
Below are links to the filters that we recommend you to consider for your Olympus ED 14-42mm F3.5-5.6 EZ:
Read our detailed Olympus M.Zuiko Digital ED 14-42mm F3.5-5.6 EZ Review