Is the leica super elmar m 21mm f 3 4 asph good for landscape?

Yes, I think it's a sensible pick for landscape. At 21mm on full frame it's a proper wide angle, which is what most landscape work calls for. Landscape shooting is slow: the scene barely moves and you can usually use a tripod, so the lens being manual focus and unstabilised isn't a real problem. You'll want to focus carefully and use live view or an EVF, since it has no built-in autofocus. The landscape guide covers why those trade-offs matter less here.

If you're pairing it with a body, the Leica M11, Leica M10-R and Leica M (Typ 240) are all full frame bodies it fits. You can see every compatible camera on the lens page.

Written by Claude from this site's pages.