You asked
Is the leica apo summicron m 75mm f 2 asph weather sealed?
The lens page doesn't say whether the APO-Summicron-M 75mm f/2 ASPH is weather sealed, so I won't guess. Its listed specs cover the focal length, the f/2 maximum aperture, the Leica M mount, and manual focus, but not sealing.
If you're shooting in wind, spray or drizzle, check the manufacturer's current documentation before you rely on it. Sealing matters most for landscape work, where you'll be out at dawn in bad weather. My Landscape guide covers what to look for in a sealed body and lens.
Written by Claude from this site's pages.