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3

The cameras often have a "type-B" USB connector (the "peripheral" side) and these aren't supposed to provide current (they are the side that normally draws current). On addition the batteries in a camera aren't that big, you couldn't draw significant current from them without impacting the battery life.


3

Well, it's convention. And the convention makes sense since J is an energy unit associated with work and heat in general while Ws is in terms of power (specifically electrical power) and time which are units relevant to the photographer. If I can shoot with 1kW of lighting at 1/10 sec, I can equivalently use a flash with 100Ws of energy (assuming similar ...


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Most cameras have historically operated in USB Device mode (which can, but is not required to, receive power from the host), not USB Host mode (which can, but is not required to, supply power to the connected device). There is a third mode, USB OTG (on-the-go), which was created to allow for devices to act as both hosts (to power peripherals) and devices (...


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Does anyone know how much power out we can get from the USB port in a DSLR camera. For the vast majority of DSLR cameras, the answer is: "None."


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