I have been having more and more fun experimenting with light box photos. This shot was made with the grapes placed on top of a cheap DIY lightbox with a Canon 580EXii stuck inside shining up through the table surface. Up top I used a 24″x24″ soft box with a 430EXii on one side as the main light, and a circular reflector on the other side to act as fill.
I did several different versions of this shot, both with my Canon 7D and the popup wireless flash controller, and with an evaluation Canon 5D MkII having another 580EX on top to serve as flash controller. I found very little difference in picture quality between the two sets in cases like this where the lighting is good. The 5DMkII really shines best when the light is dim.