Carlos mentioned:
the Rollei 35 working with the Vivitar 283
A warning, discussed I think before on this list.I got one of the first 283's some time more than 30 years ago and I still have it.
I tested it once by manually connecting the hot shoe contacts. Wow, does it put a load on the shutter flash contacts! I have used it on several cameras with no apparent damage and still have it with all the accessories (light angle spreading and narrowing, remote trigger, etc.), but no camera that I can notice.
I heard, on this list I think, that the design has been changed and there are also adapters to reduce that contact load.
In any case I suppose it's not much worse than the load of a BC flash pack for flash bulbs.
DAQ