Helping you to clearly recognize dust and other particles on your image sensor, the ; Quasar Plus 7x Sensor Loupe ;from Visible Dust ;is a fixed-focus magnifier featuring Bright Vue technology and six LED lights that illuminate and help locate spots on a sensor. Benefiting high viewing clarity is the use of extra-low dispersion K9 optical glass, which has been treated with a MgF2 fluorine coating to maintain high resolution, minimize chromatic aberration, and render dust and spots with a 3D quality. Its design also incorporates a 52mm threaded ring to accept optional optical filters or hoods in order to improve viewing conditions and block ambient light. In addition to gaining a magnified view of your image sensor, this loupe can also be used to view negatives, slides, or other small objects.