I am becoming obsessed about nailing down this technique! I played a round with my setup as shown to the left.. Patterns on the floor, good window light today, pyrex glass dish with water and oil, camera and hoodman. tripod and macro rail. Initially I saw this annoying orange light in the left side and finally realized that it was the AF assist beam reflecting off the surface. Could not disable it in the menu so I solved that with duct tape over the beam!. Still have to fiddle with technique to find the right amount of water to keep the details on the glass dish bottom (lines, bubbles and so forth) from coming through. The old Tamron 90mm 2.5 Macro at 2.5 helps a lot. Enjoy, Jeff