The filter thread size of Panasonic Lumix G X Vario PZ 45-175mm F4.0-5.6 ASPH OIS is 46mm.
Below are links to the filters that we recommend you to consider for your Panasonic 45-175mm F4.0-5.6 OIS:
Read our detailed Panasonic Lumix G X Vario PZ 45-175mm F4.0-5.6 ASPH OIS Review