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

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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