Actually if you check schematics, the high voltage on the 2s, the 4T etc goes
through a small SCR
not an IC, so safe up to ~400V. There is a very old thread on this where Joe
Gwinn and I debated
this (He also thought it went through an ic.) The schematic of the 4 is
extremely badly done, as
they use weird symbol for ground and it takes some deciphering to figure out
how the trigger
circuit is connected.
I routinely have used my 2S on a Sunpak 611, with ~250V on the trigger.
Somebody did report
getting their 4 wet, and zapping the processor, but all bets are off with water
providing
alternate paths to adjacent pins.
Basically all the common OM's are good for high voltage flash triggers.
Tim Hughes
--- John Hermanson <omtech1@xxxxxxxxxxx> wrote:
>
> I think the 283's are like the Olympus 300, QA310 flashes, trigger
> voltage up around 100V. I have seen a many OM-1/2 with pitted flash
> contacts (main and safety contacts). A few OM-1's with contacts
> seriously burnt. Some pitting is expected over the years. I would not
> use one of these old flashes on the 2S, 3Ti, 4, 4T as the trigger
> voltage goes through an IC. Definitely a no-go on all E digital bodies,
> why chance it? E flash contacts are rated at 5V
>
> ___________________________________
> John Hermanson
> Camtech Photo Services, Inc.
> 21 South Lane, Huntington NY 11743
> 631-424-2121 | Olympus OM Service since 1977
> http://www.zuiko.com | omtech1 AT verizon dot net
>
>
> Chuck Norcutt wrote:
> > Some old Vivitar 283's are rumored to have trigger voltages as high as
> > 600 volts. We should ask JH if he's ever seen any OM-1's with X-sync
> > switch contacts that show evidence of arcing like old ignition points.
> > :-) <http://www.botzilla.com/photo/strobeVolts.html> I don't recall
> > the trigger voltage on my own 283 but I'm pretty sure it's over 250.
> > Old 285's had pretty high voltages also. But the last 285 I measured (a
> > 4 or 5 year old 285HV model) was only 12 volts. Still, technically too
> > much for some early Canyon digitals like the D60 and 10D which could
> > only handle 6. The aforementioned 12 volt 285HV was actually used on a
> > 10D for a long time without apparent incident but I read somewhere that
> > it leads to long term shutter damage because of the tie between shutter
> > and X-sync.
> >
> > ps:
> > A Radio Shack volt meter to check the trigger voltage is a lot cheaper
> > than a Wein SafeSync. So is a radio slave or other type of slave to
> > isolate the flash from the camera body. Hmmm. I wonder if my old 283
> > will fry an oboy radio slave. :-) :-)
> >
> > Dr. Flash
> >
> >
> > usher99@xxxxxxx wrote:
> > Apparently
> >
> >>some flavors of the 283's are OK and have a lower T Voltage, though I
> >>don't remember the details and I know mine is not.
> >
> >
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