I have everything setup correctly on the camera and strobe itself, it is in auto and the strobe power is adjusting strength, I can hear the difference in pop... just something is not 100% right. You saw the F8.0 being totally over exposed.
My question was whether the camera's internal strobe is required to hit the subject for the TTL to function correctly or not, or does it make no difference. The way I read it, it would seem the YS01 manual suggests it should.
If I totally mask the internal flash (how I had it in the past) except for route to my sync cord, and I believe the
YS01 is not replicating the pre-flash, wouldn't the camera receive no feedback from the pre-flash (well determine from dark scene feedback that it need a big discharge) and plan initially to give a bigger discharge, until feedback of the real exposure? or does the pre-flash acheive nothing.. I mean there must be a purpose...
Alternatively, if i don't mask the internal flash, then the preflash would still feedback, which has to be a good thing. Camera understands it needs to discharge less and the YS01 fires during the real exposure, camera gets feedback of real exposure of both strobes still and shuts off as necessary.
Very interestingly, I did another quick test.. If I remove my camera from the housing.. hold the sync cord upto my internal flash (so covering about 1/2 the window), and so both strobes hitting the subject I get what I would consider really good/consistent results.. with the YS01 still always firing, with green light.
Anyway, I'm starting to think the issue is something to do with the pre-flash.. but that is just a hunch.
---------- Post added June 15th, 2015 at 01:12 PM ----------
The d/sTTL strobe mode MUST have a camera with Auto flash exposure functioning and that means there will and must be a pre-flash. You cannot get d/sTTL function with any Inon or YS strobe even if the strobe is set to d/sTTL unless the camera is set in an exposure mode and flash setting that provides auto flash compensation and the resulting pre-flash.
Hope that is clear as mud.
N
Hi Nemod,
Really appreciate your comments/assistance. It's just this bit. Yes my camera does have a preflash.. but is that pre-flash needed mostly for the strobe to work in TTL or is it more importantly also needed as feedback to the camera sensor during the pre-flash to determine roughly the amount of discharge the camera will make.. and can this lack of pre-flash feedback to the camera sensor be the cause for the variations in TTL exposures