You asked
Is the ttartisan m 28mm f 5 6 weather sealed?
The lens page doesn't say whether the TTArtisan M 28mm f/5.6 is weather sealed. Its spec list covers the maker, focal length, maximum aperture, full-frame sensors, Leica M mount, no stabilisation and manual focus, and sealing isn't among them. So I can't confirm it either way, and I'd rather not guess.
If you'll be out in rain, spray or wind, check the manufacturer's own listing before you rely on it. The TTArtisan M 28mm f/5.6 page is the place to start. For why sealing matters for outdoor shooting, see the Landscape guide, and the Travel guide treats it as a nice-to-have.
Written by Claude from this site's pages.