Re: Using a Contax TLA-200 flash on a Canon EOS 5D - will my camera blow up?
- From: Alan Browne <alan.browne@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 11 Mar 2006 11:46:35 -0500
jw@xxxxxxxxxxxxxxxxxx wrote:
The standardised flash-triggering voltage is 24 volts.
Canon, in its infinite wisdom, lowered the maximum allowable flash
trigger voltage in some of its digital cameras (my G2, for example) to 6
(IIRC) volts. A flash with a 24 volt trigger could "fry" those cameras.
So, check your 5D specifications as well as the TLA-200 specifications
(or use a voltmeter to measure it directly) to avoid damage.
Because I am impatient, last night I tried the TLA-200 on my 5D in
manual mode (on both the camera and flash). The flash fired without
any problems, but obviously I had to set the apeture on the camera
relative to the distance reading shown on the top of the flash.
What you said about those voltages has worried me though! I will see
if I can find out some info from the specifications, but if I were to
do a voltage test would I just have to place the test sensors on the
hotshoe contacts and fire the shutter? How would I test the voltage of
the flash?
It's in the manual. For the 20D it's about ±250 V for the sync terminal and I doubt it will be worse for the 5D. Verify that this applies to the "hot shoe" leads as well, though it should.
IIRC, some later film Canon's such as the Elan 7 did not tolerate high voltage flash sync circuits.
http://www.botzilla.com/photo/strobeVolts.html
For a variety of flashes sync voltages
Cheers,
Alan
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