Here we have a Vivitar produced Canon FD Matched Doubler 2X Tele Converter X2 for Canon SLR cameras. It is in excellent condition and includes both caps.

This tele converter serves two purposes. First, it will effectively double the focal range of any Canon FD lens. Multiplying the focal length by a factor of two will essentially turn your 50mm lens into a 100mm lens, your 28mm lens into a 56mm lens, etc.

The teleconverter will be carefully packaged and shipped immediately. (Included case may differ from one shown.)