Yes—changing lenses outdoors in cold weather is generally safe. Interchangeable-lens cameras are not airtight, but condensation usually is not the problem outside. It forms when a cold camera or lens meets warm, moist air, such as when you bring gear indoors. Cold outdoor air is typically much drier, so opening the mount briefly in the same cold environment normally won’t cause condensation inside the camera.

The main risks during a lens change outdoors are not moisture but particles entering the mount: snow, rain, dust, or windblown debris. To reduce that risk, change lenses quickly, keep the camera angled downward, and use your body or clothing to shield the opening from blowing snow or moisture.

The bigger condensation concern is moving cold gear into a warm building. In that case, sealing the camera in a bag before going indoors helps it warm up gradually and can prevent moisture from forming on or in the gear.