More on Amazon.com : http://www.amazon.com/gp/product/B003EB3G6M?tag=thefatkidin06-20
Fotodiox Lens Mount Adapter M42 (42mm x 1 Thread Screw) Lens to Nikon Camera for Nikon D7100
Premium-grade Fotodiox adapter
Smooth surface for effortless mount
Infinity focus allowed
Anodized aluminum construction
24 Month Manufacturer Warranty
