I was trying to find out what you were trying to do. I still don't know, sorry.
Were you trying to balance flash light on the subject with ambient light on the background? It doesn't seem so as the light on the subject and background seems to be the same judging by the light on her shoulder and the balloons both coming from camera right.
Were you trying to just give a catchlight in the eyes? Again it does not seem so.
Av gives you little or no control over the shutter speed.
I use M and just adjust the exposure for the background to give what I want there and then adjust the flash power for the subject.
You mention that the model is waiting for the TF beep. Why is that a concern for the model? Focus is for the photographer to fix. The Tf indicator is shown in the viewfinder. The model should hold until the flash fires. Maybe she moved between?
The focus is difficult to see on a small jpeg but it seems to be on the fan and not the eyes. True Focus only works for rotation movement. If the camera is moved back or forwards it doesn't work.
Good luck.
Hello Bob, thanks for the feedback
Initially I tried using manual and use the pop up flash for fill light, but I just couldn't for the life of me manage to balance the flash and ambient light. I then went and got the profoto B1 head and decided on 1/125 at f5.6 but that just seemed to have the background to dark and the model blasted with light. By that time we moved to another location in the temple that was now getting more sunlight, so I gave up on the flash and tried shooting wide open at ISO100 and getting anything from 1/125 to 1/500. The light improved considerably but I forgot to put the ISO back down to 64.
So all in all I arrived at the temple with a model but without a plan of how to shoot her........joke really
The idea behind getting the model to listen for the true focus beep was that it was taking up to 5 seconds to get the TF and as models like to pose then pose again and again, I told her that when she hears the beep to then hold her pose.......I thought that was working okay.
I will be trying again on Monday with another model and this time it will be in manual at f4+ with 1/500 minimum shutter and like you said light the model up with flash
Full size JPGS can be seen
HEREOnce again thanks for the feedback and tips on how to try and get this right
Neil