Originally posted by mcgregni The effect of the built-in wireless control flash should be very limited indeed. How do you know that it is illuminating your subject? I would expect to see light on a subject from the trigger flash (in controller mode) only at very wide apertures, high ISOs and very close, or a combination of these. Could you tell us you exposure settings? Assuming the pre-flash and metering is working correctly, then so long as your subject distance is within the limits you should get a good exposure. What is the distance between your flash and the subject, and again what settings are you using for the shot?
The fact that the Sigma is firing suggests that the channel is set OK.
@PJV - Thank you for the video. Gary Fong has these great videos, but I happened to see this one and it didn't help me that much, as I did set up the flash correctly, the channels were right, the on-camera flash triggered the Sigma but I noticed that it does capture my on-camera flash, still, on the subject.
@mcgrgni - As soon as I get back home, I will post images of my setting and how I notice that the on-camera flash contributes. I will reply to you, with these, but in the mean time, yes, the on-camera flash triggers the Sigma, no problems there. How I notice it's contribution to the exposure as well is by noticing that I see it's reflection in surfaces, or I see it projects my subject's shadow in the back, even if the Sigma is placed so that it doesn't fire directly on my subject ( I am sure that it's not the shadow caused by the Sigma). Also, another way of figuring out is by placing my hand in front of the on camera flash, leaving it side space so that the Sigma can pick the trigger up. When I do that, the Sigma fires, the image looks a lot better *no direct frontal flash on the subject*, and I don't see the on camera unit's reflection anywhere.
What I also struggle with, is how exactly to set the Sigma's flash intensity when off camera? Maybe it's too powerful and that is the reason why I have the impression the on camera flash contributes. I did try to read the manual but it lost me. Maybe you could help out with a suggestion on how exactly to bring down it's intensity.
Thank you so much, guys!