T2 - Canon EOS lens adapter for Canon EOS 5D 6D 7D EF 1D, 50D 60D 70D, 1100D 1200D 100D 700D 650D 600D 550D 500D (Electronics)
The role of this ring is replaced, the objective of the SLR camera with this ring. This then allows, thanks to its release 'standard' to adapt many kinds of devices (magnifiers, microscoped, lunetted astronomiqued, some older lenses, etc.) As for me,