I posted this question in an underwater photography forum, as that's my focus, but didn't have much success in getting responses. Maybe it's too technical a question, but I thought i'd try again in different forums.
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 underwater Sea & Sea 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 slow 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.
this is my first post on this forum and English isnt my first language so please be gentle
I made the switch from Nikon to Sony. One of the key features that attracted me towards Sony was the EVF and the resulting "What you see is what you get" in the live view.
A7iii + Godox V860ii S or Xpro S both as masters. (Several GM and G lenses)
As soon as I attach and turn on my flash unit or trigger, the camera overrides the "setting effects ON". That means I no longer get a real representation of the ambient exposure but a "simulated" exposure in the viewfinder. I get that they do that in order to be able to still see something when using strobes in very dark environments, but I am wedding photographer and mostly use my Flash as a fill or for creative effects. I would love to still be able to see just the ambient exposure so that I can expose for that and add the fill flash.
I`ve read on several sites that to overcome that "problem" some people use the Shot Result Preview mapped to a custom button. That would be a nice workaround but in my case IN DOESNT WORK. All it changes is a tiny bit of exposure if I really increase F-stop numbers. But when I compare the resulting exposure using this function to the exposure resulting in turning the flash off (or with the picture taken), it doesnt match at all. Also, Shutterspeed and ISO changes dont influence the exposure using Shot Result Preview.
Does anyone experience the same problem with their A7iii?
Is there a setting I have missed which interferes maybe?
Is there a known issue or bug with the A7iii?