Tamron 100-300mm f/5-6.3 (186D/86D) - unknown Mount

The Tamron 100-300mm f/5-6.3 (model 186D/86D) is a budget-conscious telephoto zoom lens, typically produced for autofocus systems such as Canon EF, Nikon F, or Minolta AF. It offers a significant reach in a relatively lightweight package, suitable for daylight sports and wildlife photography. The variable aperture helps keep the lens portable, though it requires good light for the best autofocus performance. When buying a used 186D, the autofocus motor should be tested for speed and accuracy, as these can wear over time. SDS checks the zoom action for any gritty feeling or excessive play in the barrel. As an externally extending zoom, it is prone to drawing in dust; we check to ensure this hasn't developed into internal fungal growth. The electrical contacts on the mount are also inspected for cleanliness and wear.