Connect your favorite manual Canon FD lenses to your Ribcage with this C-Mount adapter. The Canon FD line is one of the largest lines of manual camera lenses ever produced. These lenses are a great choice for the value minded with a huge selection of high quality lenses available online for low prices. Have a look in that old camera bag, there’s probably some great lenses hiding in there with that old film camera! Canon FD lenses will experience a crop factor of 5.7 with the Ribcage.