You asked
Can I adapt the zeiss milvus 18mm f 2 8 to canon rf?
I can't confirm this one. The Zeiss Milvus 18mm f/2.8 page lists only two mounts, Canon EF and Nikon F, and Canon RF isn't among them, so I won't tell you it works on an RF body.
It's a manual-focus lens with no autofocus, so on a mirrorless body you'd focus by eye, which suits it well. My general advice on adapters is that mirrorless mounts are shallow, which makes adapting manual lenses easy. Before you buy anything, check with the adapter's maker that it supports this lens and your body.
Written by Claude from this site's pages.