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Sunpak 24DX Flashgun
I only bought this (from Ebay) to complete my GAS motivated collection of Sunpak DX Series units. I now have all seven (and duplicates of a couple). They were made up to about the year 2005 and were superior to the contemporay Pentax units IMHO, and usable straight on modern Pentax cameras with the Pentax foot module. It was relatively cheap at £16, and came with the generic, single contact, STD-1D module which interested me.
I did not think I would use it because of its low power and lack of a tilt and swivel head, which I regard as essential for normal use. However, I now think I might use it for lighting a flash brolly for tabletop work, and for my slide duplicator.
The STD-1D is the only DX series module to have a sync cable socket. I guess the reasoning was that it was for older cameras that had no dedication features, and some of those do not even have any hot shoe contacts, so the ability to fit a sync cable was provided. But the cable socket will be useful for wiring up a flashgun on a light stand.
Oddly, the generic STD-1D modules tend to fetch higher prices on Ebay than the dedicated modules. Usually they cost more on their own than this one did attached to a flashgun.