The filter thread size of Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS is 52mm.
Below are links to the filters that we recommend you to consider for your Panasonic 14-45mm F3.5-5.6 OIS:
Read our detailed Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Review