You asked

What filter size does the ttartisan m 100mm f 2 8 bubble bokeh take?

I don't have the filter thread size for the TTArtisan M 100mm f/2.8 Bubble Bokeh on this site, so I won't guess. The lens page lists its maker, focal length, aperture, mount and the Leica M bodies it fits, but not filter size.

To find it, check the lens barrel or front cap for the filter size, usually marked with a ⌀ symbol, or look up the maker's spec sheet before you buy filters.

If you're after filters for this lens, a circular polariser or ND filter is what I'd reach for first. The landscape guide explains what each one does.

Written by Claude from this site's pages.

From these pages