I have a Sunpak 422 and two OT-1D modules. I just tested using one of
my OM-2sp's. One of the modules works as expected and gives both flash
ready and blinking confirmation. The other module also works as
expected as long as I don't tighten the shoe down. But, similar to what
Jay reports below with his T20 connector, if I tighten it down I still
get the flash ready indicator but the blinking confirmation doesn't work.
I can not see any physical difference between the OT-1D's except the
serial number stamping. The one that works fully in the 2sp is serial
5F86C. The other is serial number 7H89B. The font used on the stamping
of this one is slightly smaller than the the "OT-1D" label. The font
used on the stamping of serial number 5F86C is significantly larger than
the "OT-1D" label.
Based on this I just decided to check my OM-2n as well. Neither of the
OT-1D's give blinking confirmation whether tightened down or not. In
fact, when tightened down, one of them (not sure which now) lost the
main contact until I repositioned the flash. Neither shoe ever lost the
flash ready indicator, however.
Just to double check my own testing I tried a T-32 as well which, of
course, operated perfectly. It's hard to understand how there can be
such variablity in these simple electrical contacts. I just checked my
personal archive and note that John Lind complained about this same
problem a couple of years ago.
Chuck Norcutt
Jay Drew wrote:
> I've got a couple of Lester Dine ring flashes that use the Sunpak control
> head including the OT-1D. I only
>
> Use them in TTL mode. The do indicate flash ready and the blinking
> confirmation for correct exposure.
>
> The only problem I've encountered was mounting the unit on a T20 connector.
> When you tighten down the clamp
>
> It causes the contacts to disconnect. The same amount of tightening on the
> shoe of the OM4 and OM4t did
>
> Not cause the problem. I got a couple of other OT-1D's and all exhibited
> that same symptom.
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