Tamron introduced two teleconverter models exclusively for select Tamron lenses. These accessories make it easy to expand the versatility of the attached lens. The teleconverter 1.4x increases the focal length by a factor of 1.4x, while the teleconverter 2.0x doubles the focal length.

Increases maximum focal length. Although the maximum focal length is increased, the minimum object distance remains nearly the same, so the magnification ratio during close focusing is enhanced. Both teleconverters are carefully designed and constructed to preserve the original superior image quality of the lens. The 2.0x model uses one LD (Low Dispersion) lens element to suppress aberrations. BBAR (Broad-Band Anti-Reflection) coatings are deployed on both models to help minimize ghosting and flare.