What are the hot boots on the digital camera for?

Hot boots is a fixed interface slot, which is used to connect various digital imaging devices (including digital SLR, DV and traditional digital cameras) and different external accessories (including lightning, GPS locator, camera light and microphone).

The shape of hot shoes is a bit like an inverted square U-shaped metal with one or more metal contacts in the center of the U-shaped. When installing the flash, the fitting at the bottom of the flash is inserted from the back of the camera and fixed with the fastening screw at the bottom of the flash. The U-shaped metal contact is usually disconnected from the hot shoe metal, and when it is connected, the flashing action is triggered.

The physical dimension standard of "standard" hot shoe interface is determined by ISO 5 18:2006. However, different brands of flashlights may add other contacts besides the central contact to enrich their functions, such as exchanging information with the body, such as flash power, luminous color temperature, synchronization mode and so on. And the details such as trigger voltage have not been standardized, so there may still be electrical incompatibility between brands.

Extended data:

Hot shoes have single contact, double contact or triple contact. Different contact types determine their functional differences, such as TTL flash, which must be sensed through special contacts. There is at least one contact, so there is only a flash function, and the flash output needs to be controlled by itself.

TTL is the abbreviation of THROUGH THE LENS, which means measuring light through a lens, which is mainly different from paraxial cameras. This TTL measurement is more accurate and is the main mode.