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Old Nov 15, 2003, 4:46 AM   #1
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Default G3- A fatal dose of "trigger voltage"

I posted my first notice in "newbie help" by mistake so forgive me for repeating myself . Since then I have used the (coal fired) Pentax AF240Z (sounds like a motorcycle) with my G3. It appears to work and the results are o.k. but the gun does not respond to commands from the G3 so I guess its just working manually. I set the flash adjust on the G3 to manual and auto but it made no difference either way . I set the Pentax to manual and programme ,both worked (full blast).When I set the Pentax to Auto the Pentax sensor worked as it should and regulated the output accordingly .The results were fine especially bouncing off a white ceiling. Also, the built in flash on the G3 is cut-off when you mount the Pentax. Having said all this, my main worry is this "trigger voltage" thing. Is it the case that if it works then it works and if your G3 melts then S**T happens ? So-far so-good, but I think I will quit while my G3 is still working .If anyone else has risked giving their G3 a fatal dose of "tigger voltage" let me know..
Derek the Dalek from "Bonnie Scotland"
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Old Nov 15, 2003, 6:09 AM   #2
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Repeated from the other post:

Quote:
Originally Posted by derek the dalek
I have tried my old Vivitar 273 (coal fired job)! but nothing happens.
Just hope you didn't already wreck your camera with that flash...digital camera makers recommend that you only use flashes with a trigger voltage (what's on the contacts of the hot foot) of around 6 volts...the Vivitar 273 has a trigger voltage of 290 volts (no kidding).

Suggest you check out the following links:
http://www.botzilla.com/photo/strobeVolts.html
http://www.botzilla.com/photo/G1strobe.html
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Old Nov 15, 2003, 7:24 AM   #3
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Quote:
Originally Posted by Mike_PEAT
Repeated from the other post:

Quote:
Originally Posted by derek the dalek
I have tried my old Vivitar 273 (coal fired job)! but nothing happens.
Just hope you didn't already wreck your camera with that flash...digital camera makers recommend that you only use flashes with a trigger voltage (what's on the contacts of the hot foot) of around 6 volts...the Vivitar 273 has a trigger voltage of 290 volts (no kidding).

Suggest you check out the following links:
http://www.botzilla.com/photo/strobeVolts.html
http://www.botzilla.com/photo/G1strobe.html
Thanks for your reply Mike,
I followed your link to http://www.botzilla.com/photo/strobeVolts.html
and looked up the list to find the PentaxAF240Z was measured at
4.8v.. I have just measured my one (flash that is) and it reads 7.5v
but this with new batteries so maybe Richard Hartland was'nt using brand new batteries?.I also measured the voltage on my Vivitar 273 auto thyristor at 73volts!! My G3 still lives but I really wish Canon or even the shops that distribute the G3 would do their homework and give people like us this information when we buy the goods!! Furthermore when I called Jessops they rekoned the their own make 280??? would work but according to the list would not? What a minefield this is!!! The Sigma 500 series looks like a safe bet would you agree?
Derek
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Old Dec 5, 2003, 5:31 AM   #4
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I just rang Jessops about the trigger voltage in the 280AFC and was told it is 5.5Volts.
I plan to use it on maual on the 300D as bounce flash for interior shots[/quote]
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Old Dec 28, 2003, 8:54 PM   #5
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Default Vivitar 285 w Canon G3

My Vivitar 285 measures 5.5V DC at the hot shoe terminals. I've used it with the G3 with no apparent adverse effects.

Out of curiosity, I measured the terminal voltage on the Vivitar 102 that I use with a compact Olympus film camera and found the voltage to be 195V DC. Obviously, I won't be using that flash with the G3.

------------ Bill
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