Kenko MC6 2x TeleConverter for Pentax 67 Lens USA

The Kenko 2x Teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. For example, using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/4 will now be f/8. Teleconverters are not recommended for wide angle lenses. While the Teleconverter maintains the original lens minimum focus range, it effectively cuts the depth of field in half. The system automatically couples with your cameras mechanics to make operation fast and easy. The Teleconvertere also features 6 elements in five groups and is multicoated to protect your equipment and pictures from light damage.