radio transmitters ...

removed account4 · Apr 11, 2019

i have a camera that can't take high trigger voltages. i have a wein saftey sync but heard that they sometimes wear out,
i ALSO have one of the same sorts of safety syncs that lumedyne made for their 244 but i was thinking of going wireless...
has anyone used the cactus 4V ? is there a pc socket for the one you attach to the flash ? i only saw the hot shoe attachment. do i need to worry about trigger voltage if i use the cameras pc ( body ) socket? i can't remember and i don't really want to fry out my camera!

thanks !
John

trendland · Apr 11, 2019

During the service there was a lession at the airforce : "Reflection and absobtion of radio wafes!"
Concerning "Tacan" (tactical air navigation!)

That should be a need today : a camera inbuild Tacan reciver, Elt,GPS, and not to forget :

STEALTH ABILITYS

with regards

Chan Tran · Apr 11, 2019

jnantz said:
i have a camera that can't take high trigger voltages. i have a wein saftey sync but heard that they sometimes wear out,
i ALSO have one of the same sorts of safety syncs that lumedyne made for their 244 but i was thinking of going wireless...
has anyone used the cactus 4V ? is there a pc socket for the one you attach to the flash ? i only saw the hot shoe attachment. do i need to worry about trigger voltage if i use the cameras pc ( body ) socket? i can't remember and i don't really want to fry out my camera!

thanks !
John

The PC socket and the hot shoe may use the same contact device. Or if they are different they would have the same rating. So if it's not safe for the hot shoe it's not safe for the PC sync.

trendland · Apr 11, 2019

jnantz said:
i have a camera that can't take high trigger voltages. i have a wein saftey sync but heard that they sometimes wear out,
i ALSO have one of the same sorts of safety syncs that lumedyne made for their 244 but i was thinking of going wireless...
has anyone used the cactus 4V ? is there a pc socket for the one you attach to the flash ? i only saw the hot shoe attachment. do i need to worry about trigger voltage if i use the cameras pc ( body ) socket? i can't remember and i don't really want to fry out my camera!

thanks !
John

Sorry jnantz - noticed too late your question was from serious concern!
For me reading the headlines and that bejond it was a question in regards of :
Do one need this all!
Yes 4volt looks not as much but for cameraelectronic a power of just + 0,6 Volt can be its
"Overkill" = 3 times death = +0,2 Volt is too much!
So be aware with 4 Volt!

with regards

MattKing · Apr 11, 2019

Modern radio transmitters tend to have tiny trigger voltages - to the extent that at least one person on Photrio has had problems using some of them with older, mechanical leaf shutter lenses for a Mamiya RB67 (whose flash synch circuits can build up resistance over the years).
Mostly though, the problem isn't at the camera end. The problem is at the flash end, where the flash trigger voltage may be higher than the receiver can stand. I have some ancient Bowens monolights that present 600+ volt trigger voltage to the synch connection - I use a Wein Safe Synch and an optical remote trigger with them.
Some of the Cactus models include the safe trigger range in their specifications.

jim10219 · Apr 11, 2019

I use Phottix triggers. They can handle up to 300v on the receiver, so most old flashes are safe with them. They're also pretty reliable and feature packed flash triggers that aren't too expensive.

You could also build a simple voltage divider circuit using some connectors, a box, and a few resistors. Though to do it right would require knowing the exact voltages you're working with and some math. Plus you'd want to test it first, to make sure you got the math right. And you'd need a good voltmeter or oscilloscope to do that, as a cheap voltmeter may not give you a correct reading since we're working with such short impulses. It would be cheap and easy for someone with the right gear and know-how, but might be out of the realm of the average person, because O-scopes and good voltmeters aren't cheap. But if you knew someone who was into electronics, I bet you could talk them into building you one for a fraction of the price of most other solutions.

bdial · Apr 12, 2019

Pocket Wizards can take up to 300 volts

RalphLambrecht · Apr 12, 2019

jnantz said:
i have a camera that can't take high trigger voltages. i have a wein saftey sync but heard that they sometimes wear out,
i ALSO have one of the same sorts of safety syncs that lumedyne made for their 244 but i was thinking of going wireless...
has anyone used the cactus 4V ? is there a pc socket for the one you attach to the flash ? i only saw the hot shoe attachment. do i need to worry about trigger voltage if i use the cameras pc ( body ) socket? i can't remember and i don't really want to fry out my camera!

thanks !
John

Yes, trigger voltage is an issue with camera PC sockets too.typically, mechanical camerasMF and LF are more robust to high trigger voltages than digital cameras but, it is a general issue;Even more sturdy electrical contacts will wear out eventually(as I was told by a Hasselblad repair service). I have moved to inexpensive(Chinese) wireless triggers and they work well.

M Carter · Apr 26, 2019

I'd start with a cheap $15 radio slave from Amazon or Adorama; they won't trip from some of my larger gear (RB lenses and a spotmeter), but work fine with smaller shutters; I've found them to be really reliable and they're almost disposable at that price.

AgX · Apr 26, 2019

MattKing said:
Modern radio transmitters tend to have tiny trigger voltages - to the extent that at least one person on Photrio has had problems using some of them with older, mechanical leaf shutter lenses for a Mamiya RB67 (whose flash synch circuits can build up resistance over the years).

Good point.

AgX · Apr 26, 2019

jim10219 said:
I use Phottix triggers. They can handle up to 300v on the receiver, so most old flashes are safe with them.

Typically even the "high" trigger voltages are lesser than the charging voltages of the main capacitors. I only found two flashes listed (out of many) that got sync voltages of more than 300V.

removed account4 · Apr 26, 2019

i ended up getting a cactus 4 from cactus, it was the one that used to be sold
by midwest photo exchange in the "strobist kits" ... it just arrived today ( SATURDAY )

radio transmitters ...

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