The filter thread size of Panasonic Lumix G Vario 35-100mm F4.0-5.6 ASPH Mega OIS is 46mm.
Below are links to the filters that we recommend you to consider for your Panasonic 35-100mm F4.0-5.6:
Read our detailed Panasonic Lumix G Vario 35-100mm F4.0-5.6 ASPH Mega OIS Review