No, this is a manual focus lens. However, it features an electronic interface that allows for focus confirmation indicators in the viewfinder and aperture control via the camera body.
Yes, the Milvus series features special seals against dust and splashes, including a blue rubber seal at the mount to protect the camera-lens interface.
The lens uses a large 82mm front filter thread, which is standard for high-end professional wide-angle glass.
Yes, it works perfectly on Canon RF-mount mirrorless cameras using a standard EF-to-RF adapter, retaining full electronic aperture control.