The Vivitar MC7 AF 2.0X Teleconverter (also known as a tele-extender) gives you the dramatic effect of doubling the focal length of your lens by 2x, and will cut back the amount of light by 4x (2 f/stops). The MC7 features a 7-element, 4-group design with multi-coated lens elements, and fully automatic diaphragm coupling. With the Vivitar MC7, your prime lens’ depth of field is reduced by 1/2, but retains the prime minimum focusing distance. Using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6.
The MC7 AF 2.0X converter has genuine Gated Array IC (Integrated Circuitry). This means that not only the converter’s own unique data but all data sent from the camera body provides full exposure metering and linkage for electronic flash photography.
Teleconverters are not recommended for lenses wider than 50mm, e.g. 28-105mm. However, full AF operation is only possible with lenses with open aperture of f/2.8 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera’s AF sensors. Manual focusing is recommended when using lenses with smaller open f-stop value than those given above.
Note! NOT for use with Canon EOS EF-S lenses
Vivitar‘s 1.4x Teleconverter can add another tool to your camera bag, at a very affordable price. This compact and lightweight 1.4x teleconverter multiplies the focal length of any compatible lens by 1.4–a 100mm lens with this teleconverter attached, for instance, would give you the view of a 140mm lens. Autofocus will not work with lenses with a maximum aperture slower than f/4.5. The multi-coating on the converter reduces flare and ghosting, common problems with digital cameras. And, the minimum focusing distance is unchanged. This teleconverter comes with a lifetime warranty.