High speed sync - wireless

I have K10d set up for wireless flash with flash mode set to wireless. I have AF-360FGZ set to wireless slave - high speed flash. Problem is that in this combination I cannot push the shutter speed over 180th second using Tv or Av.

Is high speed sync possible wirelesly?

Are things different if I have another AF-360FGZ on the camera as controller?

Thanks

Scott

you can't do wireless high speed sync with the in camera flash because the in camera flash can't do high speed sync. I think it would work if you had two 360s or a 360 and a 540.

Thanks - tested and it works just as you suggest. 2 external flashes are needed for high speed wireless flash.

Scott

K10D high speed Sync also works with the oncamera/off camera Fg/5p cable setup.

Unfortunately I sold my leads on eBay 3 months ago thinking I would never need them.

I've often used my 360fgz off camera hand held but I've just been testing out the wireless range, 2 360FGZs, one on camera, one off. High speed sync mode at 500th second and f5.6 and 800asa. The one on camera in control mode.....

With the remote flash 3m from the camera pointing at the subject 4 m from the camera it would not fire.

With the remote flash 5m from the camera pointing at the subject 4 m from the camera (ie behind the subject pointing at the camera) it would fire.

With the remote flash 1m above and behind the camera pointing at the subject 4m from the camera it would fire.

I replicated the results taking the 360FGZ off the camera and using the built in flash as controller. I had to reduce shutter speed to 180th of course.

I wonder if anyone can explain what's going on?

The big red bit on the front of the AF360 is the sensor, it has to see the controlling flash, in you scenario it looks like the flash body masked the controlling burst.

I am left wondering why the remote flash worked when it was behind the camera. It would have nor received direct light from the on board flash there.

In one shot I covered the small round sensor with my finger. The flash still fired. However when the whole red base of the flash was covered with my hand it did not fire....

It also did not fire with the flash at 4m 'side on' to the camera - I would have thought there was no shielding effect there.

I'm finding this all very inconsistent & would like to understand more....

thanks

Scott

When you had the remote flash 3m away, are you sure it was pointing directly at the subject and not, perhaps, askew in such a manner that it was unable to catch the control flash reflection from the subject?

Otherwise, I cannot think of any reason why the flash would not have fired.

Oddly, there does seem to be some inconsistency in functionality.
When the control flash (attached to the camera) is set to "not fire in wireless mode", it seems to fire anyway. I see no difference when I have only the control flash in use and have it set to fire in wireless and to not fire in wireless mode.
There is a definite difference when I have the remote flash active, so it is obvious that something isn't quite right.

Maybe just my perception, but the control flash also seems to fire its control signals with less power when in high speed flash mode than when in normal wireless mode. If that is true, it would be more critical that your remote flash be aimed in such a way that it will pick up the control flash reflections properly.

AFAIK, there is a two way handshake between the controller and the slave. The camera has to see the remote's preflash, as well as the remote seeing the controller/master signal.

Generally, I find that you need to keep the distance down - especially if the ambient lighting is high (such as outside). Don't think I've used them more than 2 or 3m apart...

Matt

In testing last night I was using the evening light. Today, in the sun, I was able to get the wireless to work holding the remote flash in one hand, camera in the other.

I did not try the same experiments as yesterday. Had the flash been further away, following Matt's comments, perhaps the range would be reduced.

Scott