Please help me. I Need the information
It's written on the lens & the inside of the front lens cap.
⌀58 == 58mm
It's also the first hit if you Google for it, on Nikon's own site.
Not sure I'll ever make it as a product photographer, f18 & it's still not sharp right through. My excuse is all I did was plonk it on top of a flight case near a sunny window & went 'click' ;)