The Tamron SP designation is reserved for products developed with special emphasis on extraordinary photographic performance. Engineers are free to innovate in an uncommon atmosphere where optical performance comes before price, resulting in optics that satisfy the demands of discerning photographers.
Tamron teleconverters provide powerful and creative options for your telephoto photography. A Tamron teleconverter mounted between the lens and the camera body increases the focal length of the host lens, providing greater magnification from the same camera position. Tamron's teleconverters are compatible with most (autofocus) and auto-exposure cameras.