The VisibleDust Quasar R 5x Sensor Loupe Magnifier uses Dark Adaptation Technology (DAT) ;to enhance visual acuity to nd dust and stains which are not usually visible in the presence of white light, making sensor cleaning difficult. ;The Quasar R uses 14 bright LEDs, 7 of which are red, with specifically chosen wavelengths to increase visiblity of dust particles on your camera's sensor. ;It also uses extra-low dispersion (ED) glass with a MgF2 flourine coating to provide a high level of clarity while minimizing chromatic aberrations to make it easier to see the dust particles.