Originally posted by pathdoc AF280T. There are more powerful TTL flashes that do the same thing, but this was the cheapest and easiest to get hold of. It's also the cheapest and easiest bounce-swivel flash to get hold of that has an inbuilt thyristor for self-management of exposure on less advanced bodies that don't have, or predate, TTL (which is why I bought it in the first place; having a Super Program and a TTL DSLR to shoot it on now is a bonus).
I also have an AF080C ringflash, but a little more practice is required with that one before I can get best results.
OK, here is something that might be useful. It will not completely replace your current flash (small limitation when used on older cam like SuperProgram) but other wise might be something to keep on your radar. All older SCA3000 era flashes from Metz (specifically 40MZ serie) are not too expensive. Those are actual real work horses, tilt/swivel, auto, TTL with appropriate Pentax SCA thing (no PTTL).
They bring a couple of interesting things: strobo mode, almost unlimited aperture values for auto mode, second reflector when using T/S and again, using appropriate adapter, will allow the cam (you istDS in this case) to work with the flash in auto mode without having to set the flash to correct aperture (it will by itself). They will auto zoom with focal length too.
The only thing you lose is TTL in Program mode on older cam. Oh and, with adapter, can work wireless too
Got 3 of them.
If you find a good deal, it might be interesting to pursue. Just my 2 cents.