Strobe Trigger Voltages

Is your old strobe safe to use on your new camera?

$Date: 2004/04/06 04:51:29 $

Some strobes (and infrared strobe triggers) use high voltages in the trigger circuit. For mechanical cameras, this is fine — but many newer, electronically-driven cameras (especially electronic 35mm SLRs like the EOS or digicams — or for that matter, EOS digicams, like the 300D) can be damaged by excessive strobe voltages.

How much is too much? What voltage might my own strobe generate? This page tries to help answer those questions. It contains a table of strobe trigger voltages, a few measured by myself but most contributed by readers of this site. It also contains some information about specific camera makes and the strobes that light them.


Canon US has verified (to me, and here) that the Powershot G doesn't like voltages over 6V.

Similarly, Nikon has specified 12V for their speedlight circuits... (though reader Steve Francesoni called to check, and their tech rep said that his N80 was good to 250V — so there may be more complexity to this story). I've heard some rumours that some Coolpix models have been restricted to 5V! (see below for more details)

Marco Fortin-Metzgen checked with Olympus Europe on his C4040 — that digicam has a trigger voltage of 10V, so Olympus too recommends strobe triggering in the 3V to 6V range.

Pentax users may want to read this related story from Gene Poon.

Ron Alexander claims his Fuji is astonishingly tolerant of high voltages... interesting (This has since been verified by Rob Scrimgeour of the forum — their members got a message from Fuji also stating the 400V center pin limit).

(According to some opinions, high voltages can even endanger mechanical cameras, albeit after years of use)

The ISO 10330 specification ("Photography -- Synchronizers, ignition circuits and connectors for cameras and photoflash units -- Electrical characteristics and test methods," 1992) says that all ISO-compliant cameras should be able to accept trigger voltages up to 24V. Though a Canon engineer is the nominal head of the ISO workgroup, for some reason Canon continues to insist that their cameras tolerate no more than 6V (make that Canon USA — an email from Canon Canada says: "There is not a maximum voltage requirement for the hot shoe terminal on the PowerShot G1." Go fig!). For that reason I've tagged strobes that trigger at voltages between 6V and 24V as "your call." Depending upon who you ask — the camera or strobe manufacturers — those strobes are acceptable or they are not.

The ISO spec doesn't really seem to hold a lot of weight!

The Strobe List

The following list is based on either manufacturer specs or direct measurements (To measure the trigger voltage of your own strobe, follow the instructions here). If you can add to this list, please post a message or mail me your numbers, along with a description of how you obtained them (measurement, from the web, from the manufacturer, etc). I may be slow in getting your data into the list (just check the journal), but I do follow-through eventually! — KB

Follow at your own risk.

While I have every reason to believe the information presented here is correct,
I cannot be held responsible for the voltages coming from your flash equipment. Prudence is the purpose of this web page.

If this site is helpful to you, Click Here to list it on PHOTOBLOGS.ORG and help share it with others

Mfgr Model EOS Safe? Trigger Voltage
AchieverTZ250 Yes(?) A mere 0.5V (!), measured (with some due incredulity!) by Russ Kendall
Göran Samuelsson reported 8.5V on his test
115 A/S Your Call A mere 2V, reported by "KC"
but 10.6V from Paul Turton
TZ 250 Your Call 8.5V, also reported by "KC"
260AF Yes A mere 3V, measured by Jeremy Tan
(Note this is not the Achiever 260T)
DZ260 Yes A mere 3.4V, measured by Paul Achary
(Same as the Acheiver 260AF)
260T No 220V, reported by "KC" and
253V from Mike Marty
321AZ No 297.6V, measured by David Gonzalez
632LCD Yes ~4.7, measured by Tanguy Kervahut
Agfatronic2A No 185V-210V, measured by Juha Kopsa
201B No 80.3V, measured by Oliver Karstens
240B No 238V reported by EJ Boeve
261CB No 64V reported by Stephan Kruisman
280VB No 50+V reported by Amders Gidenstam
383 CS Your Call 6.5V reported by Oliver Schrinner
401BCS No 212V, measured by Martin Stein
643CS Your Call 6.3V & 6.7V measured on two different strobes by Craig Schroeder
Albinar90 MDT Yes (?) 3.2V, measured by Wirak Lim, but
without any luck using it with a G1
100 MDT-Twin Yes 3.02V, measured by Richard Moore
ArgusAutomatic 9138 No 270V, measured by Rich Grochowski
Armatar90 MDT Your Call 10V, measured by Tony Bonanno
CD2400 Your Call 14.5V from WDFlannery
Balcar Super A2400 No 202V & reverse polarity reported by Bakó Imre
BauerE528 AB No 253V, measured by "Grigory" in Belarus
BlacksDZ 40 Your Call 8V, measured by Rob Thacker
TDZ 120 Yes 2.6V, measured by Paul Clements
DM360BT Yes 4V, measured by David Treble
BraunHobby No 225V, from Göran Samuelsson
28 No 220V, measured by Ernst Albert
32M Yes 2.56-3.56V, measured by "laaarrd"
34 Your Call 11.7V, measured by Ted Coffey
F34 No 160.55V, measured by Alan Buckbee
38 M Logic Your Call 7.5V, measured by Panu L
280BVC Your Call 13.6V, measured by Jean Taillon
320BVC Your Call 6.7V, measured & reported by Lars Hanssen
VarioZoom 340 SCA Yes 4.0V-4.3V, depending on battery type, measured and reported by Kai Ingman
370BVC Your call 21.1V, measured by Hannu Martiskin
20.5V from Göran Samuelsson
380BVC Your call 11.6V, measured by Peter Savage
400M Logic Your call 7.6V measured by Harmut Gruenhagen
410VC Your call 21.4V measured by Stephan Bruckmann
420BVC Your Call 11.6V, measured by Jean Taillon
440VC Your call 16V measured by Ulrich Höxtermann
BritekAS-36 Yes 5.3V measured by Peter P
SP 250 Monolight Your Call 6.7V measured by "Everett"
BroncolorPulso 4 Your call 6.5-10.8V depending on the charge, according to Leon Obers
one channel IR transmitter Your call 13.5V, per Leon Obers,
Fred Phillips reported just 3.2V
Paul Buff
Radio Remote 1
Yes 4.84V reported by Bryce Turner
Remote RC-1 Your call (same part?) 9.23V, measured by Jan C. Doddy
UltraZap Yes 6V spec reported by Peter Timaratz
(though sync with G1 is dicey)
Ed White reported varying results, from 4.8V to 13.3V on his Ultra Zap 800, according to the power settings
Ultra 600 Your call 9.3-13.6V, measured by Bryce Turner on multiple units
Ultra 1200 Your call 10.02V, measured by Jan C. Doddy
10000 Your call 24.1V, per Toney Hall
PS No 30V according to Bob Atkin'sEOS FAQ
Monolite 400 No 170V per Teemu Virtanen
Traveller No 15V (EOS FAQ)
Canon 220EX
Yes All less than 6V (Per Canon and verified by Benny Khaw). These are the strobes specified by Canon for the Powershot
More info Here
ML-3 Yes 4.99V measured by Kevin Omura,
full power only — and wouldn't trigger on the D30
011A Your Call 16.9V measured by Derek Woodlands
AB56 Your Call 7.8V measured by Bharat Mistry
133A Your Call 6.1V per Gerardo Nieto
155a Your Call 8.2-8.7V measured by Bart Harrison
(6.04V reported by Kevin Omura)
166A Yes 4.33V per Kevin Omura
177A Your call 6.77V per Ed Hahn
188A Yes 4.1V per Gerardo Nieto
199a Yes 4.99V measured - Canon rated it 6V
200E Yes ~3.9V measured by Maarten Klap
200M Your Call 12.3V measured by Tony Williams
244T Yes 4.33-4.44V measured by Daniel Griswell
277T Yes 4.8V measured by Dan Karg
299T Yes 4.75V measured by Alec Hipwell
300EZ Yes
(See Note)
3.6V, measured by Eric Jones.

Sadly, Canon's "EZ" and "EX" flash units use different TTL schemes. Despite the nearly-identical names, the "EZ" strobes (which use a system called "A-TTL") can only be used as full-power-manual strobes with pure E-TTL cameras like the G1/G2 or the D30.

300TL Yes 3.75V measured by Kevin Omura
(manual only)
420EZ Yes
(See Note)
4V, measured by Joe Filer,
4.71V with a Quantum battery per Kevin Omura.

(See note for 300EZ above)

533g Yes? 4.95V measured by Pierre Hurtubise,
but it doesn't seem to fire...
Kevin Omura also reports G2 problems with this unit
577G Yes 4.7V measured by Kevin Omura,
and tested on a G2 (in manual and auto thyristor modes)
CentonFG20 No 275V, according by Mike Johnson in London
MR20 Ringflash Yes 4.38V, measured by Geoff Kitt
FG30 No ~200V, according by Harvey Shieff
FG30DX Yes 3-6V, according by Iam Hill
FH30 Yes ~4V, according by Steve Orton (who opened up his to disconnect the dedicated Ricoh pins for use on his Olympus)
FH85 Yes 3-4V, according by Dave Anderton
FH95 Yes ~5V, according by Philip Bennett
FG105D Yes ~5-6V, according by Tom Sou — but
he also reported spotty performance with the newest EOS cameras (a polarity issue?)
CinonPro 1090C No 180V, measured by Göran Samuelsson
Chinon S-250
Yes 5.17V, reported by Scott Martin
AF280 TTL Yes 5.3V, reported by "Mike from Germany"
S-300 Your call 11V, reported by "emitc"
CobraAuto 250 No 66V measured by Susan Stewart
440AF Yes 3.5V, reported by Richard Lukey
D650 Yes 5.6V, reported by Russell Garner
700AF Yes 4.4V, reported by "John-M"
CometCX244 No 11V (EOS FAQ)

Tony Wu also called Comet's distributor, who measured 11.5V for him, right there on the phone! (now that's service!)

Contax TLA20 Yes ~4V, reported by Peter Dewdney
TLA 30 Yes A trifling 2V, reported by Brad Grigor
(watch out for those extra pins...)
TLA200 Yes ~4.11V, reported by EJ Haas
CourtenayColorFlash 2 Your Call 17.12V reported by Charles Ward,
(who reports problems using a Monolta 9xi — might be polarity?)
CullmanSL 16 Yes 4.5V, measued by Frank Gaehler
SL28 Yes 4.3-5.2V, measured by Juha Kopsa
SL 28/C[br>(same?) Your marginal call 6.3V, measured by Tom Crowning
34 AF/C Yes 4.47V, measured by Oliver Karstens
CX40 Yes 4.3-5.2V, also per Tom Crowning
MD 34S Yes 5.92V, measued by Michael Neuhaus
DC36 Yes 2.52V, also by Frank Gaehler
Digislave2000 No 200V measured by Rich Scarlet
3000 Yes 7V measured by Rich Scarlet
DynaliteAny Iffy? 10V (EOS FAQ)
Elinchrom(various) Your Call 9V these days, but back over 20 years they ran as high as 30V, according to Elinchrom Customer Service via Tony Wu
DE 250 Your Call... -14.5V, center negative; measuered by Martin Sørenson,
who had no luck firing it from a 300D
FujiGA Yes 3.52V, reported by EJ Haas
FLMX29 No 216V, measured by "Tom on AOL"
GMIInfrared transmitter No 324V, measured by Sandy Levenberg
(just for IR?)
HanimexTZ*2 No 225V measured by Simon Heath
TZ36 Yes 4.6V measured by David Cox
TX325 Yes 3V measured by Ulrich H&omlu;xterman
CX440 No 180V measured by "Dave L"
Pro 550 No 234V measured by R. Prieto
TZ755CP Yes 4.5V measured by Mike Mahoney
TS855 No 209V measured by Jonathom Holtom
tZ2500 No 196V measured by Alastair Cardwell
Hensel Contra 500 Your Call 16.3V @10microAmps for all output ranges, as measured and reported by Jan de Vreij Dwingeloo
Super Miniflash 500 No 41.2V per "Mike from Germany"
2-channel IR trigger Your Call 17V per Teemu Virtanen
HitaconMini No 190V measured by BigWaveDave
Holgon2800 HC Yes ~5.4V measured by Whay Lee
HoneywellAuto Strobolite 52 No 115V as measured and reported by Karl Haug
Strobonar 892S Yes A tiny 1.25V (!?), measured by Neil Viglione
(who had to reverse the shoe polarity)
IkeliteSubstrobe 50 Yes 5.28V from Harold Kroeker
Substrobe DS-125 Yes 5.14V, also from Harold Kroeker
ImageCBD-30 Yes 2.9V, measured by Ray Watson
CZ-65 No 201V from Dave Stacey
CBZ-2500 Yes 3V from "Kelvin"
Itorex 3000Tw Your Call... 23V, reported by Asle Feten
Jessop220TBZ No 212V measured by David Aldred
280ABZ No 70V measured by "TomCee" Cramer,
249V from Mark Butler
Kakonet4500 No 210V measured by Aapo Tammisto
Kalimar171A No 238V measured by Ted Coffey
175A Your Call 4-5V measured by Michael Meissner,
but 183V measured by Derek Misener...
TW-3600 Yes 5.71V measured by Tom Altman
KenlockTV45 Your call 10V measured by Barry Maufe
Kitstar50BC No 160V measured by Greg Bloor
KMartPro-700 No 229V measured by Bob Rinelli
KodakGear Auto No 222.1V, measured by Steve Spartz
80030 (made by Tiffen) No 235.6V, measured by Jim Gatling
KonicaHexar HX-14 Yes 5.89V, reported by EJ Haas
Hexar HX-18W Your Call 8.4V measured by Craig Schroeder
LeicaCF Your Call 10-11V measured by Joe Lim
LumedyneAll Your call 12V since 1992, about 100V before, reported
Direct from Lumedyne (see sidebar below)
Luxon132 AFc Yes 1.23V(!) measured by Tarmo Pekola
Metz 20 B3 Nope 168V reported by Gerardo Nieto
20BC4 No 185V reported by Göran Samuelsson
20BC-6 Yes <5V per Metz-Werke, reported by Duncan Burt
23BC4 No 183V reported by Frantisek Daniel
28C-2 Yes <5V per Metz-Werke, reported by Duncan Burt
30B3 No 170V tested by Jussi Ohenjoa
30BCT4 No 68V reported by Peter Cooke &
165V from Paul Nelson,
172V from Vic
30BCT4i Your Call 7.4V reported by Jose Carlos Fernández but:
173V reported by Göran Samuelsson
32CT3 Iffy 22V with new batteries, reported by Rupert Vogl
32CT4 Iffy 12V reported by Lwo v IJzendoorn
32CT7 Yes(?) 2.88V, reported by Geoffrey Chan,
5.5V from "Mike in Germany", and
9.25V from Craig Lapp
32MZ3 Yes 3.3V, reported by Samuli Vahonen
32 Z-1 Yes 3.46V, reported by Johan K in the Netherlands,
4V from "KC"
32 Z-2 Yes 4.086V, reported by Joe Lim
34BCT2 No 211V, reported by Egbert Nolte
36C-2 Yes 6V, reported by "Alex from Italy"
36CT3 Iffy 20.9V, reported by Frank Melchinger
38CT3 Iffy 6.5V, reported by Kai Dröge
40AF-4C Yes 4.4V, reported by Robert Elsinga
40MZ-2 Yes 4.74V, reported by Benny Khaw &
4.5V from "Mike in Germany"
40MZ3i Yes 4.5V, reported by Ismail Mus
45CL1 Your Call 7.6V, measured by Jeffrey Gillian
(though Metz specs this unit at 6V, and assures us it's EOS-safe — while recommending a better E-TTL unit for best performance with the 300D, like the 54 MZ-3)
45CL4 Your Call 16.85-16.88V measured by Lee Phek Thong;
Teemu Virtanen measured 14V and
spoke to Metz directly about their newest G2 adapter
45CT1 No 600V
(Göran Samuelsson measured merely 218V on his, as did Toney Hall — multiple versions?)

See this page for special info from Metz:

(Thanks Mike Guidry for the tip on this one!)

45CT4 Your Call... 14V with NiCds, reported by Peter Andersen
25V measured by Frank Melchinger... (different editions?)
and Anders Lilja reported 24.7V, but it dropped to a safe 4.56V when connected to the Metz Adaptor SCA311,
12.7V from "Mike in Germany"
45CT5 Your Call 14.8V from "Mike in Germany"
45MZ-2 Yes 5V
50MZ-5 Yes 2.6V from Trevor Connell
54MZ-3 Yes 4.17V from Paul Schuurmans
56-1 No 211V from Woo Fei Wing
60CT1 Your Call 20.89V measured by Loring Palleske
60CT2 Probably Not 28.5 measured by Rupert Vogl
60CT4 Yes 5V (EOS FAQ)
202 No 200V according to Peter Sanders
402 No 206V on this circa-1974 strobe, according to "ejb" from the UK
404 No 80.2V from "Mike in Germany"
2034BC No 207V from Ernst Albert
Minolta Auto 22 No 240.1 measured by Derek Woodlands
Auto 25 No 210V measured by Steven Ferland
Auto 28 No 200V according to Wes Quigley,
only 43V from Gene West
Auto 32 No 192V measured by Rob Babcock
Auto 128 No 297V according to Ed White
132PX Your Call/No 20-30V per Minolta Customer Service, courtesy Karen Wetterling
132X Yes 2.2V per SJ Chandler
Auto200X Yes(?) 2.9V per Brian Klug,
but 6.7-6.9V per W.S. Ryu
Auto280PX Yes 1.8V (!) per Richard Crow
Auto320X Your call 10.44V, measured by Thomas Whitehurst, but varying 5.4-8.9V according to Ian Hamilton
Auto360PX Yes 5.24V per "Nahau"
1800AF Yes A mere 1.88V per Lieven Blancke & Mark Ball
2800AF Yes 1.74V, per Manuel V. Galang
1.65V from Jeroen Haringman
3500xi Yes 1.88V, also tested by Manuel V. Galang, who reported good manual success with his G2
3600HSD Yes 3.5V, per Toney Hall
4000 AF Yes 1.85-2.5V, per Mark Vinsen
5400HS Yes 4.7V, measured by Hardeep
MinoxFC35 No 131V reported by Poul Bekker-Hansen
MF35 No 194V reported by Göran Samuelsson
TC35 No 170V reported by Poul Bekker-Hansen
MirandaZF-3 Zoom No 246V, measured by Rich Grochowski
630 CD Your Call 8.14-8.30V, measured by Robin Taylor
930 TCD Your Call 6.5V, measured by Tony Williams
Multiblitz Varilux 1000S Your Call... 6.5V, measured by Frank van der Pol
PE-20S No 6.16V, per Akira So
PE-170 No 120V, measured by Nelson Pomeroy
PE-205 No 155V, per Mike Flynn
PE-256 No 270V from Piotr Szuszniak
PE-287S Your Call 8.3V measured by Kjetil Kling Ortveit
PE-300 No 33V measured by Kari Monkala
PE-380 Your Call 10.1V, measured by "Thierry"
PE-387S Your Call 7.8V, per Alain Gleyzes
PE-480 SG
Your Call 8.4V, measured by Les Lacey
PE-3057 Your Call 10.44V, per Luigi
PE-3550 Nope 32V, per Harry Malmelin
PE-3557 Your Call 9.7V, per Robert Lee
Nikon SB-8E Iffy 21-28.4V, measured by Don Knull
SB-10 Yes 5.11V measured by Danny Manchester
SB-15 Yes 1.55, per Teemu Vertinen,
a little higher (4.25V) for Paul Crane &
3.4V from Jack McDermott
SB-16 Yes 4.14V, per Harry Malmelin
SB-18 Yes 4.6V, per Joel Elias
SB-20 Yes 5.5V, per Nikon (via "Stuart")
SB-21B Yes 4.6V, per Bernd Pickahn
SB-22S Yes 4.9-5.3V, per Leon Obers
SB-23 Yes 5.2V & 5.5V on the units tested by Göran Samuelsson
SB-24 Yes 3.8V & 4.4V, agains tested by Göran Samuelsson
5.4V from Don Swanson
SB-25 Yes 3.68V, per Colin Ethington,
even less (2V) for Fred Phillips
SB-26 Yes 5.4V measured on a matched pair by Dave Tinsley,
only 1.4V per Andrew Cassino
SB-27 Yes 4.42-4.50V, per Paul Johnson
Yes 1.5V, per Bharat Mistry
a bit higher — 3.48V — from Patrick Hopkins —
Jeff Macwright got 2.8V from his SB-28DX
SB-30 Yes 4.5-4.6V, per Jack Azud
SB-50DX Yes 5-6V, reported by Nikon to Howard Forbes
SB-80DX Yes 4.23-4.29V, measured by Dave Tewksbury
Nishika Twin Light 3010 Nope 307V, measured by Brian Lindley
NissinDigislave No 200V measured by Juha Kopsa
EF20 No 180V & 185V measured by Göran Samuelsson
21-A Auto No 130V, measured by Hans de Ru
26T No 227V, per David Peat
28TX Your call 7.5V, per David Aldred
280XP Your call 9V, per "BcBn"
Auto 300Z Yes Only 2V, measured by Gary Wong
340T No 190V measured by Eric Lejon
360TW Your Call 10.1V-10.5V, per Samuli Vahonen
360WX Digital Your call 10.5V, per Hannu Martiskin
360X Your Call 10V from Woo Fei Wing
2800G No 137V from James Tom
4500 GTE Yes 4.6V from Bill Otto
4800 GT Yes 4.55V using NiMHs, per Leon Obers
Norman24/24 pack Your Call 11.8V measured by Phil Shima
200B (Series 450) No 100V, measured by Steve Wise, though
Brian Leonard got only 29V...
400B Your Call 10.25V, measured by Jan C. Doddy,
who found he had to flip polarity for it to function with his D-60
Superlight 800 Your Call 14.15V according to Phil Shima
(who mentioned it blew-out the sync circuit.. in a Leica M6!?! (amperage? polarity?))
P2000D Pack No 48V, measured by Peter ("gicleeman")
NovatronM-500 Your Call 7.5V measured by Lonnie Harrison
600VR Power Pack Your Call 12V according to Novatron, per Neil Lubin
Novatron will modify this pack to 6V for $15
1000 Pack Your Call 9.8V measured by Pat Taber
OlympusT18 Your call 4.8-8.5V, measured by "Andy"
OM T-20 Your call 5-7.4V as it charged, measured by Brian Zimmerman,
only 2.6v from Greg Clark, who also
has a few thoughts about varying voltage results
OM T-32 Your call 7.14V/8.4V, measured by J. Mark Morris/Russ Rosener,
9.5-11.3V from Tom Mac Inerney
FL-40 Yes 3V, measured by Harry M. Fetterman Jr
PS200 No 185V, measured by Stuart Lovell
OsramBCS25 Studio No 245V, according to Göran Samuelsson
168V & 176V, measured from two different strobe units by Craig Schroeder (see below)
BD25 Studio Yes 4.5V, measured by Craig Schroeder
VS340 Yes 5.3V, measured by Craig Schroeder
Sunny Boy No 188V measured by Craig Schroeder
PentaxAF-16 Yes 5V, measured by K.B. Lee
AF160 Yes 3.8V, measured by Gary Schaker for his 300D
AF200SA Your Call 7.65-7.72V, measured by Bill Miller
Your Call 7.8V according to Pentax, and reported by John Glover
AF240Z Yes 4.8V, measured by Richard Hartland
BIF 82c Yes 6.0V, measured by Greg Clark
D79-BZS Yes Around 3.5-6V, reported by Phoenix Corp
and checked by "Tom"
BIF 82N Yes 5.5V, measured by Steve Spartz
HMS-98T No 250V, measured by Justin Kuo
Philips16B No 252V, according to Arnoud Brouwer
18 No 218V, also according to Arnoud Brouwer
25B No 65V, according to Theo Lumens
P32GTC No 300V per Arnoud Brouwer
P36CTL Yes 5.2V measured by Bernd Schumacher
P36TLS Yes 4.3V measured by Arnoud Brouwer, and 5.64V from J.E. St-Laurent
P536G Yes 4.37-4.81V, measured by Fritz Washburn
using Philips's Canon A-series hotshoe
PhotogenicAA-01A Your Call 10.3V per Jim Ngo
DR-1250 Yes ~3-4V measured by Richard Davis
(mail signed "John Smith"?)
Popular606 No 61-71V, measured by Harry Malmelin
ATD 25
Your Call 6.8V, measured by Pedro Gordinho
PrakticaB32LCD Yes 4V, according to Praktica in Dresden &
forwarded by Anton Haakman
321A No 114V, measured by Jeroen Haringman
1600A No 222V, measured by Jonathan Holtom
Bauke Coperus points out that Praktica also relabels Achiever strobes
PrinzJupiter 677TCB No 260V measured by Mark Salik
ProfotoCompact Plus Your Call 23V for the 600ws unit, according to Loring Palleske —
which fits the 22-25V range reported by Profoto Customer Service and forwarded by Tony Wu
PromasterFM600 No 196V reported by "Tom on AOL"
FM 1000 No 258V also reported by "Tom on AOL"
FT1700 Your Call 6V according to Promaster, 207V as metered by Steve Seltzer,
though "Tom on AOL" got 289V!
FTD 5200 Yes 4-5V metered by Raymond Smiley
FTD 5500 Yes ~5V metered by Mark A. Serfozo
FTD 5750 Yes 3.95V metered by Jimmy Chancey
5900 Yes 5.5V metered by Don Swanson
FTD 5950 Yes 5.12V metered by Jim Horky
7000M Yes 3.0V, measured by Dennis Yep
Promatic FTD 4000 Yes(?) 6.16V, reported by Tom Deluca
QuantarayPZ-1 Yes (also known as the SUNPAK 400AF)
<5V, according to Harold Lacadie
QB-350A No 130V, according to Joel Kiblen
QB-SZ370 Yes 5.87V, according to Chris Joubert
QB-350A No 317V/290V, according to Adam Miller/Neil Viglione
QB-383 Super Yes 3.83V, according to Thom Doonan, who suspects it's a re-labeled Sunpak 383
QB-6500A Yes 4.3V, reported by Don Thompson
QAF-6600 Yes 3V, reported by Francois Candela
5.14V from Keith L. (Rupe) Rupert
QTB 7500A Yes ~5V, reported by Mike Mantoudis
QTB 9500A Yes 4.93V, reported by Larry Haas
QuantumQFlash T2 Your Call 8V, reported by "Joel,"
who also had a talk to Quantum about flash safety and EOS cameras,
and Jan C. Doddy
4 Radio Slave[br>(older?) Your Call 6.8V, reported by Jeff MacWright (who also had a 4i)
4i Radio Transmitter Your Call 8.45V, reported by "Lad",
7.5V from Toney Hall
and 8.71V from Jan C. Doddy
Radio Slave II Your Call 5-6V, measured by "Lloyd", aka "Sparky",
8.98V from Bryce Turner
RaynoxDC-303 No 254V, measured by Mika Yrjola
RegulaVariant 740-1 Your Call 13.4V, measured by Lukasz Wysokinski
RevueC35S Your Call 10.58V measured by DJ Szegecs
C4500 No 230V measured by Fred Huttinga
Ricoh323 Your Call 10.25V, measured by "Piotrek"
Rokinon 3600 Your Call... 24V, center positive; reported by Peter Ungar, who also reported that a Canon G1 wouldn't fire it
Rollei100 XLC Nope 325V, reversed polarity, according to Gerardo Nieto, &
356V from Robin Taylor
134B No 105V, measured by Olaf Ulrich
Beta 3 No 116V, measured by Craig Schroeder
SigmaEF 430 Yes 10-13V, measured by Dennis Deblois
only 4.63V from Tom Helge Hjørnevik
EF 500 Super Yes 5.9V, measured by Lou McLaughlin
SoligorMK-2 No 230V, measured by Rich Grochowski
MK-24AS No 37-41V, measured by Michel Blanchet
30DA Yes 5.25V, measured by Greg Clark
MZ-400AF Yes ~4V, measured by Jouni Pekkanen
Excalibur 3200
Excalibur 6400
Your Call 8.4V, reported by Chris Rocca
150 Yes 6V from Ted Coffey
920MDLVP Your Call 8.4V from Ted Coffey
SpeedotronD604 No 64V (EOS FAQ)
D802 No 69.7V from Don Swanson
1205CX No 60-70V per Speedotron customer service, and forwarded by Tom Bolton.

Speedotron makes a low-voltage afdapter, part #35248, with MSRP $36

2403CX No 66V (EOS FAQ)
2405CX No 70V reported by EOS Paul Chaplo, M.F.A. — whose dealer promptly put Safe Syncs on all their rental units
Spira-Lite Sr No 186.9V measured by Don Swanson
SS600 AC No 219V from Craig Schroeder
DSF-1 No 218V, reported by "Brian Z"
who also built this adapter
Digi-Slave Pro Yes 5V, reported by SR Inc via Paul Parlee
Digi-Slave Deluxe 2000 Your Call 15V, reported by SR Inc via Paul Parlee
Digi-Slave Deluxe 3000 Your Call 7.8V, reported by SR Inc via Paul Parlee
Starblitz 16 M Slave No 170V, reported by Ray Huttenmeister
200m-Quick No 237V, reported by Jeff Oldbean
250 BAZ Your Call 6.8V, reported by Mark Brooke-Smith
320 BTZ Yes
5.66V reported by Dominique Dartois,
but it won't fire on a G2 — it actually turns off the flash circuitry in the camera! — though it functions on his mechanical Nikon F2
1000-Auto Macro Lite (Ring Flash) Yes 2.9V, reported by Jarno Verhoeven
2000BTZ No 254V, reported by Pasi Bergman
and 38.8V from Jaime Font Dominguez
2200BA minitwin No 225V, reported by Ray Huttenmeister
3200BT-Twin-S No 64V from David Cunningham
3300 DTS Your Call 10.7V from Roland Karlsson
3600 BTV Twin No 170V from Teemu Vertinen,
150V from Greg Clark
3600 DS Yes 4-5V, reported by Bob Ghysels
4000AF Yes slightly under 6V, reported by "Ed" & Peter Cooke
Ringflash Your call 6.85, measured by David Dodell
"Digital Flash" Your call 6.4-6.6V, reported by Geert Bosch,
6.78V from Sandy Levenberg
(Though of course zero volts when used as a slave...)
Remotelite II Yes 4.12V, reported by Jeroen Haringman
MG-1 Your Call 6.99V, reported by Kai Zhu
GT8 No 200V, reported by Marcos Schwindt
DS20 Your call 6.2-6.63V, reported by Marco Paganini
25DX Yes 5.46V, reported by Harold Kroeker
Digi Robot 32 Yes 3.75, reported by Gary Hays
GX14 No 160V, reported by Robert Rozee
GX17 No 288V, tested by Jason Wiebe
30DX Your Call 10.4V, measured by Ted Pembroke
7.5V down to 5V for Mon Francisco,
but Fred Phillips got a mere 4.6V
Auto 30SR Your Call 6.4V, reported by Mike Richter
Auto 36DX Yup 2.4V, reported by Fred Phillips, &
5.86V from Bob Rogers
Auto 36FB Your Call 15V, per Paul Nelson
AP-52 No 144.8V, according to Kai Zhu, and
188V by another netizen who sent a photo of his test rig, strobe, & reading...
120 J Your call 11.01V-11.6V (depnding on the meter used),
measured by Sandy Levenberg,
10.9-11.6V reported by Bryce Turner with varying batteries,
but 24.3V by Toney Hall
Auto121 No 155-215V, measured by Lawrence Yau
Auto124 No 203V, measured by Simon Block
Auto130 NO 200V, measured by "dhamant"
MX130 No 190, measured by Göran Samuelsson
134 No 43.5V, measured by Janne Rajala
Sp140 No 180V, measured by Hjalti Jakobsson
Yes... probably 5.8V, reported by Michael Kirby
6V, reported by Martin B. Reinhardt
6.8-6.95V, reported by Pierre Hurtubise
(Different batteries, or different versions of the same strobe?)
6.16V, per Sunpak (via Pierre H.)
200 No 171.5V measured by Paul Lane
Auto 221 No 173.5V measured by Robert VanTichelt
Auto 221D Your Call 9.26V measured by Akira So
Auto 222 Your Call 6.7V measured by Dean Glanville
Auto 240 No 38V measured by "Didier" en France
244D Your Call 7.55V measured by Dave Oshinsky
Auto266SR Yes 5.7V measured by "Zapped"
Auto322 NO 227V (Jay Lorenzana reported a mere 149V, after a thorough test of his unit)
Autozoom333 Your Call 7.9V measured by Roy Campbell
333D Yes A big 2.0V measured by Tom Troughton,
4.24V from Kai Zhu
344D Yes Actually reported as less than 0.25V, by Adam Rubinstein
(though Tony Bonanno's rated 4V)
355AF Yes 5.36V, reported by "gpigg"
383 Super Your call 3.74V, per Colin Ethington;
3.83, per Curtis Avery;,
6.85V, according to Sunpak's techs;
6.86V per Geoff McKnight
6.8V per Phil Shima using a Quantum battery
7.05V per Jon Boehm
& 10.29V from Dave Dill...
different batteries, different versions, or...?

Joe Templeton measured 7.2V and had a reassuring talk with Sunpak

Auto 388 Your Call 7V, measured by Göran Samuelsson
Auto411 No 193V, measured by Nick Adams
422 Your Call 10.75-12V, measured by "Wayne",
6V from Kent Fulcher (or is the 422D a different model? Richard Khanlian also measured 5.5V for his 422D)
Auto431 No 30-50V, according to Marcus Bletz
433 Your call Reported at <8V
433D Your call 7.8V, according to Jeff Tokayer &
6.4V measured by Kristina Sterling,
but only ~4V from Gerald Wang, who also noticed some variation when using alkaline versus NiMH batteries, while
Peter Yund got 14V
Your call 10.8V, according to Dave Grandeffo,
who's been using it for a couple of years on his
Coolpix950 without a hitch.
Mike Flaherty got 11.49 and plans to use it on his D30
Harold Kroeker also got 11V with both Nikon and Contax adaptors
Auto433AF Your Call 7.52V, reported by Wade Herman
(6.9V, according to Sunpak's spec reported by Mike Dubrow)
522 Your call? ?? 10.84V, measured by Charles E. Hunt III
but 170V reported by Martin B. Reinhardt and
197V from Conrad Hoffman & 195V from "Adam"...
22V from Ted Mishima — so be careful and check your strobe, there may be more than one edition of this unit out there!
Michael Foos checked with Sunpak, who reported "usually 190V."
544 Yes... 4.6V, reported by the mysterious "Tom"...
though 6.75V reported by Gary Hays
555 Your call 6.67V on mine —
Ed White reported varying outputs from 4.1V to 6.9V.
An email from Sunpak/Tocad assures me that no cameras have ever been harmed by a 555.
611 Your Call 4V reported by Kent Fulcher, but
some old models will trigger at 190V, according to Tocad (via Jonas Lohr)
622 Pro
(not Super)
Your Call 8V reported by Lou McLaughlin, 6.5V from Don Swanson
622 Super Your Call 8V, reported by Tim Brown
888AFZ Yes 5.8V, reported by Franck Michaud
1600A No 46.6V, measured by Andrew Hall
Auto 2000 DZ Yes 3V, measured by Ken Kane
2600 No 73V, measured by Ted Richards
Auto Zoom 3000 No 246V, measured by Pontus Fred
Zoom 3600 thyristor No 194V, measured by Ray Huttenmeister
Auto Zoom 4000 No 200V, measured by Max Osmond
Power Zoom 4000 AF Yes 3.6V, measured by Kees Dorsman
MS-4000 monolight Yes 5.8V, measured by Alan Fairley
4205G Yes(?) 3.75V, measured by Igor Wesdorp
(6.*V from Göran Samuelsson and Arnoud Brouwer)
PZ5000AF Yes 5V, checked by "MikeTwo" thru ToCAD's (Sunpak's) own John Long
Topca320BC No 100-105V measured by Martin Marusak
330CX Yes 3.4V measured by Oto Durkovic
ToshibaES-7 No 250V, measured by Anton Douwe
QCC-25MD Your Call 11.4V, measured by Sean Phillips
ES-30 Your Call 15V, measured by Ken Hardy
312 Nope 197V, according to Göran Samuelsson
TumaxDS20S Yes (?) ~4-6V, measured by James K.W. Wong,
who also received a mail from Tumax saying 6.8V!
116 No 185V, measured by Kiriakos Triantafyllou
988TWZ Your Call 7.6V from Woo Fei Wing
UnomatB14 Servo No 190V measured by "Alchi"
B20C No 210V measured by Tom Mac Inerney
320TCD No 34V measured by James Tom
P360TCT No 160.3V measured by Luis Sousa
VestaAuto 1200A No 25V measured by Louis Allard
Vivitar100 No 270V, per Nigel Kirlew, and
256V measured by Bambi Torres
Auto Bounce 40D Your Call an oh-so-close 6.2V, per S. Ciccarelli, who's happily using it on his Powershot G2
AF-N 132
Yes ~4V, from Per G. Østerlie
161 No ~60V per Howie Hecht
Auto 215 No ~i198V per Steve Orton
253 No 200V, from BigWaveDave
255 No 284V, checked by Greg Sutton
272 No 240V, checked by "RoyDM"
273 No 290V, also from Nigel Kirlew
283 NO (old versions)
Your call (new versions)
Older units have been reported as high as 600V!
Recent (post-'87) revised 283's ("Made in China") are safer with modern cameras, running around 9-10V. Bob Atkins reports some as low as 5V. Recently units marked "Made in Korea" have also appeared... measured at 8v by Andrew Cassino and Tony Bonanno.
Kevin Omura used a Quantum battery and got a hefty 261.4V out of his (sn3012330), while
Göran Samuelsson had two units with different voltages: 230V and 190V. Other reports have had similar variety, up to 270V.
285 Your Call 7.45-7.8V, according to "Bob from," Mike Dubbs, and "Steven at"
Peter Savage checked his 285 and 285HV units, and read only 6V.
Mike Flaherty measured around 8.5V on his 15-year-old 285, and feels safe using it on his EOS D30.
Older units may rate higher.
One correspondent had three units ranging from 8.3V to 33V...
Alan Latafat Correa checked with Vivitar and they clarified:
The 285HV has a voltage of 12V. The 285 has a voltage of 350V. Hope this helps you.
(Thanks Alan!)
365 No 46V, according to Kevin Omura
530FC Your Call 8.3V, according to Bob Thibodeau
550FD Your Call 8V, according to Ted Felix —
only 4.24V, per Stephen Sugiyama, and
5V per Timothy Horn (serial 0031524) — but
6.66V from Rick Zotz, 7.5V from Tri Do, and
10.18V (serial 5031715) by John D. Duvall...
560D Your Call 15V, according to Vivitar via John Faughnan
Series One
600 M/P/O
Your Call 8.7V, measured by "Keoeeit"
628AF Your Call 6.8V, according to Louis Carresi
using a Nikon shoe
728AFC Yes 5.77V, per Petteri Luukkanen
730AFC Yes 3.25-3.37V, per Neuz2U (Allen N)
730AFM Yes 6V, checked w/Vivitar by Ashish Bhutada
Series 1
Your Call 3.6V, measured by Saul Gurdus
1900 No 90V, measured by Samath Wije,
127.3V from Ted Coffey
2000 No 54.4, measured by Greg Speth, but
180V+ from Lou McLaughlin, who reports that Vivitar appears to have made completely different strobes with this same model number....
202V from Chuck Roake too
2500 Your Call 10.95V, measured by J. Mark Morris,
14.5V from Lou McLaughlin
2600 No 148V, reported by Ted Felix
2800 No? 140-170V, according to Bart Van Oudenhove,
though Paul Durant reports his new one measured 20V.
Dave Senciall says his G3 wouldn't fire his 140V version,
and Jack Benson reported his 2800-D (same model?) returned only 4V...
& 33.6V, checked by Gunars Lucans
3500 Yes(?) 6V, checked w/Vivitar by Bart Nathan
though Bart Daatselaar reported 9.1V from his —
Scott Slayman tried his with varying dedicated models and got varying voltages in the 4-7V range
3700 Your call 9.1-9.4V, checked on four different units with a Fluke meter by Jim Sharp
3900 Your call 9.9V, checked by Larry Wilson
4600 Your call 19.5V, checked by Dave Grant
4900 VT Yes 4.2V, checked by Wolfgang Kurth
Macroflash 5000 Yes ~6V, checked by Jay Philippbar
5200 Your call ~9.4V, checked by "Dr. Droo" Baxter
5250 Yup 5-6V depending on the module, checked by Jeff Wiseman
7600 Your Call 7.5V w/new batteries, measured by Dennis Yep
VoigtlanderVC21B No 118V measured by "rjsch"
WeinPro Sync 1
IR transmitter
Your call 15.18V, measured by Sandy Levenberg
(Newer model is reputedly 6V)
Pro Sync LX-2 Your call 10.36V, measured by Jan C. Doddy
200 Flash No 122.7V measured Don Swanson
All   See listing under "Paul Buff," above
WOC WOC Yes 5V reported by Matt Dovner
Woctron("WOC"?) 250 PC Auto Yes 5V reported by "Alex from Italy"
2500 PC Yes 5.5V reported by Dmitrios Papadopoulos
YashicaCS-202 Your call 11V, reported by Mike Flynn
CS-201 Auto Your call 11.9V, reported by "Mike from Sweden"
CS-221 Auto Yes A wee 1.75V, reported by Ken Kane
CS-240 Auto Your call 7.2V, reported by Andrzej Sosnowski

Useful Info From Lumedyne

We got a very informative note from D.J. LaDez, the GM at Lumedyne Inc:

You did not mention our Lumedyne flashes pre 1992 or so they had about 100volts with very low current. The current was so low, batteryless slaves wouldn't power up. Since 1992 we have used 12 volts with enough current to fire on all cameras and drive slave units. We do not know of anyone, including Canon EOS users, who have had damage from the 12 volt sync output.

Also keep in mind that the severely low rating on the sync voltage is while using the hot shoe on the camera, however the PC on advanced models usually has a much higher rating ( I believe it's 250 volts). Also keep in mind that product like our Sync Filter or the one I most often recommend is the Wein Safe Sync HS 6V. It is a hot shoe to PC adapter and limits the voltage of anything to 6 volts to the camera. Our Sync Filter is the #088E and is household to household connection for the same voltage but not at the camera, rather at the flash end when a household sync connection is used.

Thanks DJ!

More Comments From Nikon

Jeff MacWright found this post via

Warning: Negative voltages or voltages over 250 V applied to the camera's sync terminal could not only prevent normal operation, but may damage the sync circuit of the camera or flash. Check with the strobe manufacturer for voltage specifications.

Thanks Jeff!

(This exact wording is also found in the manual of the Nikon Coolpix 5700)

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