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Forum: Flashes, Lighting, and Studio
01-14-2018, 11:11 PM
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There was a hardware design change when the K5 was launched and (with an electronics background) I can visualise what it is / was; the described behaviour indicates that Pentax went from a transistor based solution to a thyristor based solution for the trigger circuit.
A transistor is like a relay, apply power and it switches on and remove the power and it switches off. A thyristor is like a latching relay; apply power and it switches on, remove power and it stays on; to switch it off, the current through the main relay contacts needs to become zero. And that what those 3rd party flashes do not take into account; there might be a small leakage current that is high enough to keep the thyristor in the camera in the on state.
I don't expect Ricoh to revert back to the old design.
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