[Bunch]

Ok, thanks for being patient. Unfortunately I'm still a bit confused. One more time...

I'll have transceiver 1 in my hand in TX mode. Transceiver 2 will be mounted to the hotshoe, cable attached running to the shutter port, and in TRX mode to receive signal from remote. YN 560 III has built in receiver so needs no transceiver. I thought having the hotshoe transceiver in trx makes it inoperable and it's get confused from lack of TTL.

Sorry for being slow.

[THoog]

Give me until tonight, and I'll try to do a little how-to video (don't expect too much - I'm awful at video! ).

[panoguy]

Give me until tonight, and I'll try to do a little how-to video (don't expect too much - I'm awful at video! ).

A video would help, since I'm also interested in this. (I have the 603C II version of the triggers - cable fits the K-3 and the trigger fires a flash, but not at the same time.)

[gets out the popcorn]
Do we have to sit through "previews of coming attractions" first?

[THoog]

Let's see how this does:

You Tube

You Tube

The YN-560 III is set to manual mode and wireless enabled.

The camera shutter speed needs to be 1/180 or lower, either via Manual mode or X-sync mode (this is a limitation of the Pentax shutter, not the RF-603). To save time in the video, I have the camera set to single-shot, manual focus. In autofocus mode, it will focus when half-pressing the button on the RF-603/remote fob.

---

Last edited by THoog; 06-11-2014 at 04:57 PM. Reason: Clarity

[Bunch]

Thoog, you're awesome. Nothing like video proof to show it works. Thanks a bunch.

---------- Post added 06-11-14 at 01:38 PM ----------

Last question, I promise. Does the new version allow you to sync up to 1/320 or whatever the highest speed of the YN 560 III is? I know it's not HSS but I think it's better than 1/180.

[THoog]

Last question, I promise. Does the new version allow you to sync up to 1/320 or whatever the highest speed of the YN 560 III is? I know it's not HSS but I think it's better than 1/180.

'Fraid not. The 1/180 limitation is caused by the shutter curtain on Pentax bodies, and to avoid the problem, Pentax engineers chose to have the camera disable the hotshoe if you set the camera higher than 1/180. Hopefully, this is something they are looking at improving in the next flagship body.

[Bunch]

Seems like something they could change with a firmware update. I thought the 1/180 only applied to the pop up. Wonder what the reasoning was.

[panoguy]

BOTH in TRX mode (my 603C2 issue)! I never tried that!

Oh, that is an awesome informational video. Thanks THoog (Todd). So glad I sat through the previews...

[awaldram]

Seems like something they could change with a firmware update. I thought the 1/180 only applied to the pop up. Wonder what the reasoning was.

Its the fastest speed where the first curtain is fully open and the 2nd curtain hasn't started covering the sensor.

Above 1/180 you need HSS to fire multiple smaller flashes as the slot (1st-2nd curtain gap) traverses the sensor

Most/all triggers have no way to tell the camera a HSS flash is available and so enable speeds abov 1/180

[panoguy]

Seems like something they could change with a firmware update. I thought the 1/180 only applied to the pop up. Wonder what the reasoning was.

Its the fastest speed where the first curtain is fully open and the 2nd curtain hasn't started covering the sensor.

If this doesn't make immediate sense, see this video of a high speed camera filming a D3S shutter. Watch the slow-mo of 1/1000 shutter speed for "the slot" awaldram is talking about. The burst of light from a flash not in HSS is much shorter than the time it takes for this slot to go across the sensor. Only a strip of the sensor will get the flash! This is one of those counterintuitive things about camera mechanics...

You Tube

You Tube

[dane.dawg]

Great info, thanx for taking the time to do this..

[Class A]

I thought the 1/180 only applied to the pop up. Wonder what the reasoning was.

The 1/180s limitation is unfortunately enforced for off-camera flashes as well.

I say "unfortunately" because you only get black bars in your images if your flash pulse is shorter than 1/180s. Most flash guns generate a longer pulse at 1/1 and some models allow HSS to be enabled manually.

Nikon shooters have a much easier time to shoot at high shutter speeds with flash because they don't suffer from the Pentax-imposed limitation which is the lack of any trigger signal for shutter speeds beyond 1/180s.

One can still get a trigger signal by optically triggering from an HSS-capable flash, but that's an unnecessary complication.

[Bunch]

My triggers just came and setup took all of 3 minutes. Very simple, and the triggers actuated the flash and shutter simultaneously.

[THoog]

My triggers just came and setup took all of 3 minutes. Very simple, and the triggers actuated the flash and shutter simultaneously.

That's good to hear!

[choong_dc]

I use a K3 coupled with the RF603CII and multiple YN560III without any problems. Far as long the shutter speed is below 180 or equivalent...