I have an old cheap ring-flash that I've had to rebuild because of some broken internal wiring. The unit itself is a Pentax-dedicated Vivitar, but although it has a full set of hot-shoe contacts, the only "dedication" function is the "flash-ready" indicator in the camera's viewfinder. I was thinki…

Ring-flash circuit

westfw June 14, 2010, 4:15pm 2

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