A clock appears on the display of the SLR camera. What does this mean?

A "clock" appears on the display screen of a SLR camera, indicating that the camera system time needs to be adjusted. Generally, it is caused by the long-term battery shortage of the camera. For example, it takes too long to replace the new battery, or the battery is stored for too long, which leads to the camera system returning to the factory default time. In this case, as long as the time is set to the current time in the system settings, the word "clock" on the display screen will disappear. Tip: the camera system time will be recorded in the photos taken, which is a very important data for photography: it is an important supplement to the photos, marking the time and space of the photos and the shooting time; At the same time, it is also a photo management tool that can be used to sort and filter photos.

Expansion: Single-lens reflex camera, also known as SLR camera, refers to a camera that uses a single lens, through which light shines on the reflector and takes a view through reflection. The so-called "single lens" means that the photographic exposure light path and the framing light path share a lens, unlike the paraxial camera or the double-reflex camera, the framing light path has an independent lens. "Reflection" means that the plane mirror in the camera separates the two optical paths. The first SLR camera was developed by 1909. Since 1970s, this technology has been widely used, and SLR cameras have become the new favorites of senior photographers and professional photographers.