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03-29-2011, 07:24 PM   #1
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Join Date: Mar 2011
Location: Tijuana
Posts: 1
Hot shoe Fail after First Shot

I received my new Pentax K-5 to B & H a week ago

today i test the camera with a Pentax hotshoe Sync Cord and Wescott Strobelite.

the problem is that only flash 1 time and then the flash dont fire anymore

disconnect the sync cord from the hot shoe and reconnect and turn the flash 1 again and stop flashing.

y try with another hotshoe and 3 diferent sync cords and the same problem

also conect direct in the x-sync on the camra and the same proble just fire the flash once.

pd. the internal flash work perfect. but .........

this is a configuration problem or should I send my camera to refund?
Urgent I have only 3 days more to return it to B & H


03-29-2011, 08:48 PM   #2

Join Date: Nov 2010
Location: Williston, VT
Posts: 268
usually when the camera locks up after one shot, it's because the flash hot shoe (or socket) is getting too much voltage from the trigger. Pentax cameras have a very high threshold for voltage, but going far beyond the spec will cause them to seize up, which is better than frying your hot shoe. I've had the same result from really old flashes.
03-29-2011, 10:20 PM   #3
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Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 12,361
This happens because Pentax is reverse polarized.
You need to reverse the wire going into the sync connection.
The easiest way to do this is to cut the wire and put a lamp socket and plug onto the cut ends. Then you can reverse the polarity of the wires.

I had the same problem at the studio before we went wireless (which is the best solution, BTW). I had to change the cords so that the Pentaxes would work.
04-04-2011, 04:00 AM   #4
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Join Date: Mar 2011
Posts: 2
I really don't understand: the pentax hot-shoe (where you attach the flash unit) have + or - polarity??


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