robahob 8:33pm, 16 November 2012
Hi, I've just aquired a co-worker pro wireless shutter trigger, and am very pleased with it at the price.
When I connect this via cable to my D300s and stick my cactus V4 transmitter on the hot shoe, I can't get a flash sync speed above 1/30th.
Is this normal or to be expected.
Mr. Speedlight Posted 4 years ago. Edited by Mr. Speedlight (member) 4 years ago
That seems rather low but some triggers add a fair amount of latency. I'd try new batteries. I have no experience with the V4 but I'd expect from casual reading something like a 1/160 or at least 1/125. I get a 1/250 from Phottix Strato II(s) but loose a 1/320 with Nikon SB(s) or my Norman studio group.

I get approximately 750 to 1500 meters in reliable range with the Strato II(s) depending on batteries. I doubt that you'll get close to that with the V4(s). They are pretty old technology. They should get you started.


Postscript: I place a spot of honey here to attract other ants who know more. :)
robahob 4 years ago
Thing is I get 1/250th sync normally with theflash triggers, and the problem ony occurs if I use the wireless shutter release and v4's together.
Mr. Speedlight 4 years ago
Are they on the same frequency? You might try different channels if available.
mjkzz (a.k.a zwdeal) Posted 4 years ago. Edited by mjkzz (a.k.a zwdeal) (member) 4 years ago
Like @Mr. Speedlight said, if they are on the same frequency, I believe you are getting interference between the two -- most older technology still transmit RF signal even if you released button on your remote shutter for some extra time up to 100ms (or you have not released remote shutter button yet) . . . during this time, if your V4 is trying to fire a remote flash, you get interference.

Unfortunately, if they are on the same frequency, changing channels would not help much as for older technology, changing channel means changing code transmitted, not a different frequency channel, so you still get interference.

I own neither of them, but this is how older tech works based on my personal projects related to this.
robahob 4 years ago
Hi again, honestly not trying to bump this, but had a thought.(for a change)
Could the flash be trying to use a pre-flash then be unable to recycle for main flash, and if so can I get around this?
rudy__ 4 years ago
No. You don't have the problem when not using the remote shutter trigger.

If two different devices use the same frequency and transmitting at the same time you will get interference. The radios look for a code to match on before they accept that then should trigger the attached device (flash, camera).

The remote trigger for the camera is sending out a signal. Both the camera's reciever and the flash receiver hear it but only the camera's radio responds.

The camera after a small delay activates the transmitter for the flash. That transmitter is sending but so still is the transmitter that triggered the camera. Both of these signals are seen by the flash's receiver and it can't pick out only the V4 transmitter.

Only when the remote radio trigger stops sending is the V4 receiver able to hear only the signal from the V4 transmitter and understand the channel code and then is able to fire.

This interference delays the firing and that reduces the sync speed you are able to use.
Mr. Speedlight Posted 4 years ago. Edited by Mr. Speedlight (member) 4 years ago
Do I understand that Strato IIs uses different frequences in the same 2.4 GHz band so one can use one chanel for flash and one for shutter release?

Dave Hartman
Leo @ IM 4 years ago
This does sound a bit strange, V4s are generally resistant to interference and sync very fast.

Make sure the shutter trigger is only connected to the shutter port on the side of the camera and not to the hotshoe. Connecting shutter releases to the hotshoe (or PC port) will cause sync issues. The shutter release must fire first. The camera then opens the shutter and only once the shutter fully opens will the flash fire.

The V4 transmitter must be mounted on the cameras hotshoe and not connected to the shutter release in any way.

Also do the usual battery check : make sure you have fresh Alkaline batteries (NOT rechargeables) in the V4 receiver and a fresh 23A in the V4 transmitter. Flat batteries cause 90% of sync issues with triggers.

Definitely also try changing channels and let us know how it all goes.

If none of the above works all I can think of is that you may have a shutter transmitter that sends a very long, loud pulse which swamps the 433MHz band completely. Your best bet would then be to swap to another shutter or flash trigger system, either cable or 2.4GHz such as V5s so that the 2 systems can't possibly interfere with each other.
ChrisVPhoto 4 years ago
If the Channels are set to the same, you're not giving the camera enough time to receive the signal, and physically open the shutter and expose the sensor. If the camera and the flash receive a radio signal at the same time, they'll both start their firing sequence at the same time; the camera obviously takes longer so it'll miss the flash, which fires first.

You need to have something that has an auto switching transceiver. It'd go like this: your radio in your hands and the one on the camera are set to the same Chanel, and the remote flash's radio is set one Channel higher. You hit the fire button in your hand, the radio on the camera receives the signal, and trips the camera. The camera opens its shutters and then sends a sync signal up through its hot shoe, the same as if you pressed the button in person. The radio in the top shoe then switches to transmit mode, and fires on a Channel higher, which trips the remote flash in sync with the camera.

I've only used PocketWizards, so I know that they have it, but others out there might. If not, you need to have two radios attached to your camera; one receiver attached to the camera's remote triggering port with a cable, and another on the hot shoe one Channel higher set to match the remote flash.
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