This little bugger is only 1/8" long, so to get this magnification (this isn't a crop) I stacked my 50/1.4 in front of the 100/2.8 macro. I'm not sure of the exact effective magnification is, but we can guess; the sensor is 22.2mm wide, 1/8" is 3.175mm, and the diode takes up about 1/2 the sensor. So, roughly 11.1/3.175, or 3.5ish. I think. Taken in a dark room with no light in front, and a 550EX behind and just enough below to be out of frame and not flare the lens stack.