Nikon NIKKOR Z 400mm f/2.8 TC VR S Lens - Manual (Page 38)

Filters
The lens is designed for use without filters, and can be used without a filter
inserted under most conditions. In situations in which a filter is required, an
optional 46 mm screw-on filter can be inserted in the slip-in filter holder as
described below.
Lift the slip-in filter holder tab, rotate it to ( ), and
remove the slip-in filter holder ( ).
38
Filters
1.