Most consumer DSLRs are commonly specified for about 0–40°C operation, though that rating is conservative and many cameras will still work below 0°C. In practice, the biggest issue in cold weather is usually battery performance, not the camera itself.

At around -9°C, expect batteries to drain much faster. Bring extra batteries, keep spares warm in an inner pocket, and rotate them as needed. A battery that seems exhausted in the cold may recover some charge after warming up.

The other main risk is condensation when moving from cold air into a warm place. Before going indoors, seal the camera and lens in a plastic bag with as little air as possible, then leave it sealed until the gear has warmed up to room temperature. This helps moisture form on the bag instead of on the camera. Repeated transitions in and out of buildings make this even more important.

So: use the camera, carry more batteries than usual, keep them warm, and manage condensation carefully when changing environments.