FD-AI Adapter Ring for Canon FD Lens for Nikon AI Mount Camera Infinity Focus Features: and . Made of aluminum alloy, very durable.  The FD-AI lens mount adapter is suitable for Canon FD mount lenses and for Nikon AI F-mount SLR camera body.  This is the adapter for Canon FD manual focus lenses used on for Nikon auto focus camera mount.  An optical ir-correction lens is equipped with in the middle of the lens mount adapter, whose high transparency is more than 98.5%, with multi-layer coating technology and color balance design, to ensure better optical performance of the FD lenses. Other features: Full manual control, manual focus, manual exposure and automatic timer. The correction objective distance can be used as well as the focus to infinity, which has a little impact on imaging.  Specification: Color: black Material: Metal, Glass Compatible Lens: for Canon FD lenses Compatible Camera: for Nikon AI F-mount SLR body Focus Mode : Manual Focus Item Dimensions: Approx. 6.5*6.5*1.5cm/2.6*2.6*0.6in Weight: Approx. 73g Package List:  1 x FD-AI Adapter ring