judialex wrote in post #2797254
but isn't it a too high value (i've read most of the digitals are for 5-6V and i found it a very large difference).
SOME digital cameras, even SOME film cameras, can only tolerate low sync Voltages (like 6 Volts).
But, some digital camera can tolerate much higher sync Voltages. Your D70 is one that can tolerate high sync Voltages (to 250 Volts, as it is with most Nikon DSLR cameras).
So, if your Sigma EF-430 has a sync Voltage of less than 250 Volts, you should be fine.
There are a lot of generalization like "i've read most of the digitals are for 5-6V" that are just ill formed, inaccurate, and do not convey an accurate picture of a much more complicated situation.
I have read that some of the older Nikon point and shoot with an external sync connector could not even tolerate 6 Volts. But your Nikon D70 seems pretty robust.
It would be nice if Canon gave a definitive sync Voltage limit specification on their hotshoes for their DSLR cameras (this is missing from the specifications). Canon does give a 250 Volt specification on their PC sync port.
Enjoy! Lon