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a6000 Internal Flash and TTL Flash Metering

a6000 TTL converter metering flash internal sea & sea YS-D2 hotshoe

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#1 foetusmachine

foetusmachine

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Posted 04 June 2018 - 02:11 AM

Hi All,

 

I'm working to understand how my a6000 works in detail with the aim of (possibly) making my own LED TTL converter. At the moment I use the a6000 with its internal flash to trigger a set of YS-D2 strobes using my optical cables. I either use the strobes in manual or TTL mode. The TTL is reasonable, but not always perfect.

 

I wanted to understand how the a6000 TTL system works, so I connected a little oscilloscope to my hotshoe x-sync pin and used the other channel of the oscilloscope with a photodiode to monitor the flash.

 

See attached 2 screen grabs for two flash types - Fill Flash, Rear Sync. I also did a rear sync, but it's result was remarkably similar.

 

I wasn't able, in any case, either Manual, Aperture priority or full automatic, to witness any pre-flash whatsoever from the camera's internal flash.

 

Does the a6000 meter TTL during the exposure? Am I missing something here.

 

Welcome any insights, comments or suggestions to be able to run another oscilloscope test.

 

Cheers! 

Attached Images

  • Fill Flash.png
  • Rear Sync.png






Also tagged with one or more of these keywords: a6000, TTL, converter, metering, flash, internal, sea & sea, YS-D2, hotshoe