The Lens Adapter for Nikon Lens to Leica M Camera from Novoflex allows the use of Nikon mount lenses on the Leica M camera body. These adapters allow Nikon lenses that do not have aperture control rings to work with the Leica M as well. Novoflex is a top quality manufacturer of lens adapters. Note: With a few Nikkor G-series lenses the weather sealing on the lens has to be removed to fit with this adapter. This does not affect the function of the lens.