The filter thread size of Nikon AF-S Nikkor 180-400mm F4E TC1.4 FL ED VR is 41mm.
Below are links to the filters that we recommend you to consider for your Nikon AF-S 180-400mm F4E TC VR:
Read our detailed Nikon AF-S Nikkor 180-400mm F4E TC1.4 FL ED VR Review