Single lenses deform light to magnify targets, a second lens - bonded in perfect lenticular plane to the first - balances light distribution and wavelengths to perfectly replicate the target down range. You won't get color fringing (aberrations) or focus differences as you get farther from the optical center - UV Doublet™ is sharp edge to edge.
UV Doublet™ comes pre-installed in a lens cartridge with an ULTRAVIEW branded microfiber lens cloth.