렌즈 분리하면 센서가 바로 노출되지않나요? 미러리스 살때 이런덮개 따로 없는것같던데 렌즈 분리하고 바디만 보관시 센서에 먼지안등어가게 이런게 있으면 좋을듯한데 이런걸 뭐라고 부르나요?