Manfrotto 521PFI focus/iris focus control issue ...

We're using a Manfrotto 521PFI focus remote control with a Panasonic 170 and something's not right. When we adjust focus to the desired distance -- say, 30 feet -- it will drift down to 26 feet or maybe soar to infinity ... until we wrestle it undercontrol again.

As far as we understand, this issue is not a setting. Focus assistance setting on the 170 is OFF.

And when we remove the 521PFI, on-camera focus operates correctly -- we can set it on 30 feet -- or 10 feet or 20 feet or 63 feet or whatever -- and it doesn't drift or go off on it's own like when the 521PFI is attached.

Any ideas as to what the problem is?

Thanks,
Bradley
 
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