A hot shoe is a mounting point on the top of a camera to attach a flash unit and other compatible accessories. It takes the form of an angled metal bracket surrounding a metal contact point which short circuit an electrical connection between camera and accessory for standard, brand-independent flash synchronization.
The hot shoe is a development of the standardised " accessory shoe", with no flash contacts, formerly fitted to cameras to hold accessories such as a rangefinder, or flash connected by a Prontor-Compur.
The dimensions of the hot shoe are defined by the International Organization for Standardization in ISO 518:2006. Details such as trigger voltage are not standardised; electrical incompatibilities are still possible between brands.
In addition to the central contact point, many cameras have additional metal contacts within the "U" of the hot shoe. These are proprietary connectors that allow for more communication between the camera and a "dedicated flash". A dedicated flash can communicate information about its power rating to the camera, set camera settings automatically, transmit color temperature data about the emitted light, and can be commanded to light a focus-assist light or fire a lower-powered pre-flash for focus-assist, metering assist or red-eye effect reduction.
In 2014, camera accessory manufacturer Cactus combined these electronic extensions into a multi-brand hot shoe on their wireless flash transceiver V6. With multi-brand ISO hot shoe, cameras and flashes from different manufacturers work together.
In 1988 Minolta switched to use a 4-pin proprietary slide-on auto-lock "iISO" connector. A compatible 7-pin variant, which allows battery-less accessories to be powered by the camera's battery were also made, but not widely used. Konica Minolta and Sony Alpha digital SLR cameras are based on Minolta designs and used the same connector, officially named Auto-lock Accessory Shoe, as well up to 2012. Since the electrical protocol remained mostly compatible, TTL and non-TTL adapters exist to adapt ISO-based flashes to iISO hotshoes and vice versa.
Sony also used a variety of other proprietary hotshoes for other digital cameras, including the ISO-based 6-pin Cyber-shot hotshoe, the 16-pin Active Interface Shoe (AIS) and the ISO-based 16-pin Intelligent Accessory Shoe (IAS). Some of their Sony NEX cameras used a proprietary Smart Accessory Terminal (versions 1 and 2). In September 2012, Sony announced a new ISO-based 21+3 pin Multi Interface Shoe for use with their future digital cameras of the Alpha, NEX, Handycam, NXCAM and Cyber-shot series. This quick-lock hotshoe is mechanically and electrically compatible with a standard 2-pin ISO-518 hotshoe, but electrically compatible with the previous Auto-lock Accessory Shoe with extensions, so that passive adapters Sony ADP-AMA and Sony ADP-MAA allow to use digital-ready iISO flashes on new cameras and some new Multi Interface Shoe equipment on older cameras, while providing compatibility with standard ISO-based equipment as well.
Canon uses a non-ISO-based 13+1 pin hot shoe, named Mini Advanced Shoe on some of its camcorders.
The ISO 10330 specification allows for a trigger voltage of 24 volts. Some manufacturers, particularly Canon, ask for no more than 6 volts. Flash units designed for modern cameras use voltages which are safe and effective, but some older flashes have much higher voltages, up to hundreds of volts, which damage electronic triggering circuits. Some use negative DC polarity, or AC.
iISO hotshoe contacts are only protected up to ca. 5 volts in some cameras. Minolta documented all their cameras' electronically controlled and ISO hot shoes to be protected up to 400 volts.
It is possible to connect an older high-voltage triggering flash to a camera which can only tolerate 5 or 6 volts through an adaptor containing the necessary voltage protection circuitry, typically using a high power TRIAC. Such adapters drain power from the flash's trigger voltage and therefore often do not need a power supply of their own.
In order to avoid dangerous loops when connecting equipment in complex studio setups, better adapters offer voltage protection and galvanic isolation of the units. Such adapters will ensure that there is no electrical connection of any kind between both sides of the adapter, including ground. They use either or to transfer a safe trigger impulse from the camera to the flash. They are powered by batteries, as their electronics cannot be powered from the flash. As an example, Minolta offered the PC terminal adapter PCT-100 (8825-691) for this purpose, which worked as a galvanic isolator and could withstand 400 volts DC or AC. The similar Sony PC terminal and ISO hotshoe adapters FA-ST1AM and FA-HS1AM also offer galvanic isolation as well, but only up to 60 volts DC or AC.
Flash servos and radio triggers, e.g. PocketWizard, can also provide electrical isolation, as trigger and receiver unit are physically separate. The camera is only presented with the low voltage used by the local trigger unit, and the remote receiver unit is designed to tolerate up to 200 volts from its flash port. Slave flash, where the flash from a safe flash unit connected to the camera triggers an unconnected flashgun which, if connected, would present a dangerous voltage, is another way to use a flashgun which cannot be connected to a hot shoe; indeed, it can be used for a camera with built-in flash and no hot shoe.
The trigger voltages provided by some modern flashes or radio triggers can also be too low to reliably trigger electronic circuits in the camera or receiver. Trigger circuit voltages below ca. 2 to 2.5 volts may exhibit this problem, unless the triggering circuit is specifically designed to work with such low voltages.
Older cameras equipped with an electro-mechanical trigger contact may exhibit yet another problem. If they provide both an ISO hotshoe and a PC terminal, both are typically wired to the same trigger contact in the camera rather than triggered independently as in cameras with electronic triggering circuits. When only the PC terminal is used and nothing is connected to the hotshoe, a flash with high trigger circuit voltages connected to the PC terminal delivers this voltage on the normally unprotected middle contact of the camera's ISO hotshoe. If the photographer's eyebrows accidentally make contact with the middle contact, the electrical shock can cause pain or even injuries. One way camera manufacturers have used to avoid this problem was to use two independent trigger contacts, which, however, could cause flash synchronization problems. Another, as utilized by Minolta in all such cameras supporting a PC terminal, was to add a small switch on the side of the ISO hotshoe which disabled the middle contact until something was inserted into the hotshoe.