The visible dust quasar plus sensor loupe is a unique tool that can be used to identify the smallest of spots on the sensor the plus is an improvement on the sensor loupe 7x with an improved focusing system and 52mm metal ring which allows the use of filters and close up lenses for higher contrast and magnification the bright vue technology used in quasar plus uses six patented super bright leds with vari angled orientation designed specifically to create a 3d image to identify the smallest