You may want to look at this short blog:
https://www.photo.net/discuss/threads/olympus-250mm-f2-0-46mm-drop-in-filters.194423/
It duscusses what you are asking about, and includes the Nikon types.
Seems that standard 46mm filters can be used.
>
>Any other Olympus OM Big White (250/2, 350/2.8) owners out there?
>
>The 46mm filter holders for these are more rare than the lenses themselves!
>
>Has anyone been successful with other lens-makers' drop-in filter holders?
>Nikons (in particular) seem to be plentiful and cheap on evilBay, but not
>so cheap that I'm willing to order one "on spec," unless someone can assure
>me they're interchangeable.
>
Chris
When the going gets weird, the weird turn pro
- Hunter S. Thompson
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