The rig has two SB-80 flashes and a SB-29 ring flash. Focusing is done with… IR lasers that are pointed at the virtual focus point of the camera. The second 60mm f/2.8 lens is for detecting the reflected IR laser signals. When an insect passes through the virtual point, the IR signal detects it and a controller triggers the external shutter. Because of the extremely short shutter lag, the “hit rate” of this system is almost 100% and the insect is always in the frame. The whole rig weights 7.2 kg (almost 16 pounds) and it took Fotoopa 4 months to build.