[HUG ] Re: Lens PC socket grounded to body?

much thanks all.. I was hoping to put an optoisolator into the loop to
'free it from the ground'
possible a diode to prevent current flow from the motor drive cable?

Just seems odd that I can find no record of problems with the ELX and
relay mode on pocket wizards..

Eric


On Sat, Apr 26, 2008 at 11:34 AM, Wilko Bulte <wb@xxxxxxxxxxxxxxxxx> wrote:
> Quoting Eric Korenman, who wrote on Sat, Apr 26, 2008 at 07:50:04AM -0400 ..
> > any real electronic geeks (like me) out there?
> >
> > In trying to figure out why my 503ELX and 40mm FLE won't work with a
> > pocket wizard in 'relay mode' I found:
> >
> > That on on setup the PC socket on the lens and the motor drive cable
> > both seem to be grounded to metal housing of the camera.
> > IE, in the right situation, you can get current drawing across the PC
> > socket and the motor drive cable (around 6V).
> > There is no current flowing through the PC socket itself, as expected,
> > but the common ground is sure to be what is fouling the 'relay' mode
> > on the pocket wizard.
> >
> > Question: Isn't the PC socket on the lens supposed to isolated and not
> > grounded to the camera lens mount?
>
> The outside of the PC socket is in contact with the lens tube.
>
> On a C lens you can see it is simply riveted to the lens tube.  I just
> measured my CF40, same here.
>
> I'd would add a small relay plus battery to this contraption.  That makes
> it "free from ground".
>
> Wilko
>
>
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