You asked
Can I use adapted lenses on the panasonic lumix s1r?
The site doesn't cover adapters, so I can't tell you how an adapted lens will behave on the Panasonic Lumix S1R. What I can tell you is which lenses fit it directly through its L-Mount. For a standard zoom, I'd start with the Panasonic Lumix S Pro 24-70mm f/2.8 or the Sigma 24-70mm f/2.8 DG DN Art. For a fast prime, the Panasonic Lumix S 50mm f/1.8 is a cheap way in.
Lenses made for APS-C also work on the S1R, in crop mode, which frames 1.5 times tighter at fewer megapixels. If you're comparing options, the sensor sizes guide explains what that means in practice.
Written by Claude from this site's pages.