The 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 300 mm lens will effectively increase the focal length to 600 mm. A lens set to f/2.8 will now be f/5.6.
Teleconverters are not recommended for lenses wider than 50mm.
This 2x converter is made to be used with the older Nikon 35mm SLR film csmeras with a metering prong.
Multi-coated elements result in crisper images
In the Box
Vivitar 2X Manual Focus Teleconverter for Nikon Non-AI with Prong