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03-22-2016, 04:48 AM   #1

Join Date: Dec 2011
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Acon R930 multi flash setup HSS fun fact using Metz-Canon flash as second unit

I stumbled upon the following fun fact.

Pentax K-3 II with Acon R930 trigger on top. Camera set tp 1/1000 shutter time, well into HSS territory.
5 meters away the Acon receiver with Pentax AF540 I flash in HSS mode.

So far: As usual works nicely in wireless PTTL-HSS mode.

Now I also happen to own an Metz 58-2 for Canon (!). Turned it on off camera and it starts in slave mode 1/1 power. Fine.
Since at shutter speeds beyond 1/180 the center trigger contact in pentax doesnt send a signal, only optical slave works.

Now the fun part:
The optical slave Metz will actually fire at the right time (no issues with Pentax preflash)!
And: There is no shutter shadowing in the image at 1/1000.

So I now have the option to fire two flashes in HSS speeds using just one Acon pair and that with a "non-compatible" off brand flash.
Obviously the power on the Metz needs to be adjusted manually.

Since I also have a Canon Yongnuo 568EX I guess I'll try three flashes later.

No idea why it works but it does.

Last edited by beholder3; 03-22-2016 at 05:09 AM.
03-22-2016, 05:03 AM   #2

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QuoteOriginally posted by beholder3 Quote
I stumbled upon the following fun fact.
Whatever works, works. No need to understand how or why.

I think the Acon triggers make a lot of interesting flash combinations possible.
I haven't even tried them with my Cactus v6 yet.
03-22-2016, 05:11 AM   #3

Join Date: Dec 2011
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Original Poster
Tried the YN568EX and it semi works, so there is no shadowing, but seemingly the burndown rate is not good so it only sheds much less light than the Metz.
03-22-2016, 06:36 AM   #4
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QuoteOriginally posted by beholder3 Quote
So I now have the option to fire two flashes in HSS speeds using just one Acon pair and that with a "non-compatible" off brand flash.
You should find that choosing anything less than 1/1 (full power) on the Canon will lead to only part of the frame being illuminated by the Canon (-> black bar effect).

The Canon will not emit an HSS pulse burst so you are using it in a HyperSync-like fashion.

03-29-2016, 03:29 AM   #5
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QuoteOriginally posted by beholder3 Quote

No idea why it works but it does.
Strobist: Rise (and Fall) of The Machines: Understanding t.5/t.1 Times

Its nothing to do with you triggers the requirements are only
1 camera able to provide flash trigger faster than 1/180
2 flash 1:1 t.5 greater than shutter period.

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