Sunpak 433 Af on 400D

Started Feb 1, 2008 | Discussions thread
Roonal Senior Member • Posts: 2,505
Not conclusive or official "proof"

m1ks wrote:

I've heard this so many times, could you show conclusive proof of
this? I doubt it very much...

The XXD series PC socket is rated at 250V trigger voltage, the
hotshoe of ALL the XXXD and XXD series is 6V safe trigger, If anyone
has this in official Canon text I'd love to read it

-- hide signature --

From camera gear reviewer Bob Atkins -

"Also, by using a semiconductor switch rather than a mechanical contact, the flash trigger voltage limit has been raised from around 6v on the 10D (and most other consumer EOS bodies) to 250v (as found on most of the EOS pro bodies)."

"As mentioned earlier in this review, the 20D can support a flash trigger voltage up to 250v (vs. 6v on the 10D and 300D) due to the use of a semiconductor switch rather than depending on a mechanical contact."

Quotes above from


From camera gear reviewer Bob Atkins -

" The EOS 20D maximum flash sync voltage is 250v (for both the hotshoe and PC terminal), the Digital Rebel XT maximum sync voltage is also 250v, not 6v as I had earlier reported. Canon have recently stated that the Digital Rebel XT does in fact share the 250v sync voltage with the 20D and other high end Canon EOS bodies. Sorry for any confusion on this point. "

Quote above from:


From Tech Tips by Chuck Westfall (Canon’s director of media and consumer relations)

(Question posed) " I recently posted a question regarding the safe maximum sync voltage for an EOS 30D on . A reply led me to an article called Tech Tips answering a number of Canon-related FAQ. You addressed the safe sync voltage for a number of models, including the 20D, but I was wondering where I might be able to find published data on the safe sync voltages for the entire range of Canon cameras (or maybe just the 30D, as that's the body I'm using now). "

(Answer from CW) " It's likely you'll never see an official list of all Canon SLRs according to this specification, because Canon Inc. (our parent company in Japan) simply doesn't do things like that. I've been with Canon USA since 1982, so I'm in a pretty good position to know Canon Inc.'s habits. However, I'll be happy to provide you with my unofficial list:

Canon Digital SLRs safe for TCV up to 250 volts:
EOS-1D Mark II N, EOS-1D Mark II, EOS-1Ds Mark II, EOS-1D, EOS-1Ds
EOS 30D, 20D, 5D
EOS Digital Rebel XTi, XT (400D/350D)
EOS D6000/D2000, Kodak DCS560/DCS520 (circa 1998)
EOS-DCS series (circa 1995)

Canon Digital SLRs safe for TCV up to 6 volts:
EOS 10D, D60, D30
EOS Digital Rebel (300D)

Canon 35mm SLRs safe for TCV up to 250 volts:
EOS-1V, EOS-1N, EOS-1, EOS 3

Canon 35mm and IX240 SLRs safe for TCV up to 6 volts:
EOS 650, 620, 630, RT
EOS 850, 750, 700
EOS Rebel Series
EOS Elan Series
EOS 10s, A2E, A2

Canon SLRs released earlier than the T90 did not have TTL flash circuits, and comprehensive information on safe TCV levels is not available.

The trigger circuit voltage (TCV) rating for any EOS SLR is the same on the hot shoe as it is on the PC terminal (if the camera has one), but the acceptable TCV level varies according to the camera model. Incidentally, the main reason for the difference is the way the X-sync signal is generated. With the 250V cameras, the X-sync signal is generated electronically. With the 6V cameras, the X-sync signal is generated mechanically. There are no guarantees, but going forward I anticipate that most if not all future EOS SLRs will be safe for TCV up to 250 volts. "

Quote above from


Good Day,

'Money doesn't buy happiness, but it makes for an extravagant depression' by golf tournament sportscaster

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