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Dslr hot shoe laser pointer mount9/23/2023 ![]() Accessories which do not connect electrically to the camera can be inserted into hot shoes, without using the contacts. They are used with off-camera flash units, mounted on stands and connected to the camera by cable or triggered by wirelessly. There is still a need for accessory shoes without electrical function. 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. One way camera manufacturers have used to avoid this problem was to use two independent trigger contacts, which, however, could cause flash synchronization problems. If the photographer's eyebrows accidentally make contact with the middle contact, the electrical shock can cause pain or even injuries. 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 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. ![]() ![]() ![]() Older cameras equipped with an electro-mechanical trigger contact may exhibit yet another problem. ![]()
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