04-01-2021 08:02 PM
Is the center contact point (big one than other 4 small contacts) on the hot shot of my 80D always presents a trigger voltage no matter in Auto or not?
04-01-2021 08:36 PM
No, because it is a switch contact. All the voltage is in the flash.
04-01-2021 11:50 PM
Thanks for your quick response.
If it is switch contact, may I ask what the signal sends to the flash, short or open circuit?
If I do not describe correctly, what is it to the flash?
Thanks again.
04-02-2021 04:47 AM
In reality the centre contact is connected to a thyristor which is an electronic switch as opposed to being a simple mechanical switch, this is why it can be damaged by using an older flashgun that has too high a voltage on its contacts.
It is simpler if you just think of it as a mechanical switch which shorts the centre contact to ground ( the frame of the hot shoe) in order to trigger the flash.
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