I posted a thread several weeks ago about this issue. So I took the flash and camera and used it at our company's Holiday party which had over 300 attendees in a large catering hall. I flipped down the wide angle diffuser and just took pictures. The settings on the camera was ASA 400 and a lens opening of F6.3 on Aperture setting on the camera. Using my Sigma 17-70 mm F2.8-f4 lens I was able to get very good exposure and the histogram confirmed a good distribution of pixels throughout the entire dynamic range of 0 to 255. Right now I am kind of busy but will upload a sampling once I get past next week's holiday. 