This is probably going to seem like a very stupid question, but I can't find the answer in the manual. In manual focus, there is supposed to be an option for a dual display image. I know the DISP/BACK button is used to engage the different viewfinder options. Using this button, I can get the dual display image on the rear LCD but when I put the camera up to my eye, I get just the single screen image. I've toggled through all the viewfinder/LCD modes to no avail. Assistance appreciated.