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05-24-2017, 01:30 AM   #1
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X-symc hot shoe adapter with P-TTL pass through?

Tried googling without success.
I noticed after testing that you cannot use p-ttl flash AND radio trigger in x-sync at the same time. Sometimes it would be nice to have off camera flash or three at location to provide some nice rimlights and room lights while using p-ttl flash as easy fill light. Now Im wondering if x-sync adapter on hot shoe would work where the socket on camera doesn't.

This could also be trigger related problem but I only have aputure triggers so cannot test further.

---------- Post added 05-24-2017 at 11:57 AM ----------

Oops, this went on the wrong forum, sorry. Could mods move this to flashes lighting and studio forum?

05-24-2017, 09:57 AM   #2
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You can use a P-TTL flash and a radio trigger at the same time ....


Some triggers have what is termed 'TTL Passthrough' (eg the Cactus V6 / V6II) and this allows a dedicated system flash to be mounted on top of the trigger (which is mounted on the camera hotshoe). The P-TTL communications are 'passed-through' the trigger to the flash, and the flash behaves exactly as if it were mounted directly on the camera hotshoe.


The two systems will work completely independently and in sync .... the pre-flashes from the P-TTL flash will occur in the normal way just before the exposure occurs, and the radio trigger will sync the timing of the radio controlled flashes communicating with it to flash at the time of exposure ..... both the P-TTL flash output and the output of the manual flashes will sync and record on the sensor at the same time and their exposures will be accumulated ...


Be aware that the P-TTL metering will not take account of the output of the Manual radio flashes, because the P-TTL pre-flashes occur before the manual flashes fire.
05-25-2017, 11:26 PM   #3
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Some optical slaves will also ignore the P-TTL pre-flash and only fire with the main burst.

That can be pretty slick...

-Eric
05-27-2017, 06:32 AM   #4
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QuoteOriginally posted by mcgregni Quote
You can use a P-TTL flash and a radio trigger at the same time ....


Some triggers have what is termed 'TTL Passthrough' (eg the Cactus V6 / V6II) and this allows a dedicated system flash to be mounted on top of the trigger (which is mounted on the camera hotshoe). The P-TTL communications are 'passed-through' the trigger to the flash, and the flash behaves exactly as if it were mounted directly on the camera hotshoe.
I am aware of those but I was wondering if there was an hotshoe adapter with x-sync and p-ttl pass trough because the x-symc socket on body does not work with p-ttl flash attached. Other option would be getting rid of my aputure triggers in favor of others and that would cost more than a bit more than an adapter.

QuoteQuote:
The two systems will work completely independently and in sync .... the pre-flashes from the P-TTL flash will occur in the normal way just before the exposure occurs, and the radio trigger will sync the timing of the radio controlled flashes communicating with it to flash at the time of exposure ..... both the P-TTL flash output and the output of the manual flashes will sync and record on the sensor at the same time and their exposures will be accumulated ...

Be aware that the P-TTL metering will not take account of the output of the Manual radio flashes, because the P-TTL pre-flashes occur before the manual flashes fire.
Yes, that would be the point. Using triggered flashes as fixed power substitute for natural light. Metering is not a problem.

---------- Post added 05-27-2017 at 04:34 PM ----------

QuoteOriginally posted by TwoUptons Quote
Some optical slaves will also ignore the P-TTL pre-flash and only fire with the main burst.

That can be pretty slick...

-Eric
Optical slaves are unreliable at the best. I would know since that's the system Im now using because radio triggers don't work in this application

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