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[OM] Re: Flash trigger voltage on the E-500?

Subject: [OM] Re: Flash trigger voltage on the E-500?
From: Tim Randles <tim.randles@xxxxxxxxx>
Date: Thu, 31 Aug 2006 09:24:16 -0700 (PDT)
ok, and I'm not going to try any of this on my baby..

cheers.. Tim

Chuck Norcutt <chucknorcutt@xxxxxxxxxxx> wrote: You measure the flash trigger 
voltage between the main hot shoe contact 
in the center of the foot and the "ground" contact inside the grooves at 
the sides of the foot.  The center contact is usually positive but some 
flashes have reversed polarity.

But it still doesn't tell you what you really need to know which is what 
can the camera tolerate.

Chuck Norcutt

Tim Randles wrote:

> Ok, thanks for that info.. I guess I would need to take a reading at the bulb 
> of the flash, and I'm not about to deconstruct my new FL-36 for that...
> 
> Cheers.. Tim
> 
> Chuck Norcutt  wrote: Nope, you didn't understand it.  The contacts we're 
> concerned with 
> aren't on the hot shoe but rather on the flash.  The power to do the 
> triggering comes from the flash unit itself.  The hotshoe simply 
> provides an electrical conduit into the camera and leads to an internal 
> switch.  The camera closes the switch but the flash provides the juice. 
>   Since the camera side is simply a switch there's nothing to measure.
> 
> In older cameras like the OM-1 the switch contacts were literally 
> mechanical... two pieces of metal make contact just like the light 
> switch on the wall.  If a flash unit had 250 volts on its triggering 
> contacts, no problem.  As the electronics revolution progressed these 
> camera switches became solid state electronic switches.  And many of 
> them could and can be turned into toast by that high voltage.
> 
> Unfortunately there's no way we can measure the capability of the camera 
>   to withstand high trigger voltages.  We're dependent on the 
> manufacturer to release the specs.  If Oly has done so I don't know 
> where to find it.  Canon and Minolta have done so but Canon has only 
> lately gotten religion... now that they can report 250 volts instead of 6.
> 
> Chuck Norcutt
> 
> 
> Tim Randles wrote:
> 
> 
>>if I understand this right, I should be able to take a meter reading of the 
>>voltage off the hotshoe?
>>
>>Chuck Norcutt  wrote: Meaure what?
>>
>>Chuck Norcutt
>>
>>
>>Tim Randles wrote:
>>
>>
>>
>>>I'll get the meter out of the shop this morning sometime, and measure it and 
>>>post results..
>>>
>>>Cheers.. Tim
>>
> 
> 
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