I have a Quantaray QTB 7500-A flash that my wife bought for me about two years ago. Either I don't understand it or it is not working properly. The camera only ever seems to know that the flash is present and turned on but has no control over it other than firing it. I have had to resort to figuring all flash exposures with this unit manually. None of the program modes work correctly and since I do not have the GN# for it even manual is quite the experiment. Also the range/aperature chart seems to be quite misleading. Why does the TTL not function? I have tried it on my film Rebel 2000 as well as my EOS 10D same results. What am I missing here? Am I an idiot or will this flash only ever work in manual modes?