Thought I would at least tell what I have been doing. I have a macro focus rail that has about 6 inches of travel. I made an aluminum extension using .125 inch aluminum, and added a piece of U channel for stiffness. I just finished making birch plywood holders to position a 3 X 5 card. I tried attaching a subject to the card, and setting up for a macro shot. I was able to set the focus, and then move the assemble to get the light the way I wanted. Rich