Shield selection method 
 Shield used to protect cameras and lenses, divided into indoor and outdoor. Select the protective cover should pay attention to: 1) According to the installation location, the correct choice of indoor or outdoor enclosure. Indoor enclosure main role is to dust, while the outdoor enclosure in addition to dust, the more important role is to protect the camera in a variety of harsh natural environment (rain, snow, cold, heat, etc.) work properly. Thus, outdoor all-weather protective cover not only more stringent sealing structure, also has wipers, spray, heating and cooling and other features. Which determines the outdoor protective cover price far higher than the indoor enclosure. Note that, due to seasonal temperature changes little in some areas, are within the camera's operating temperature, so the choice of function without normal outdoor temperature shield, in order to reduce costs. 2) selection of the appropriate size of the shield. Shield size should be larger than the camera and lens size and, otherwise, the camera and lens can not be loaded.