A teleconverter is placed between the camera body and lens. It contains a set of optics that will effectively increase the focal length of any lens with which it is used. The Kenko TelePlus MC4 AF 1.4X DGX converter has the effect of multiplying the focal length of your lens by 1.4x. The MC4 AF 1.4X DGX converter has genuine Gate Array IC (Integrated Circuitry). It means the converters unique circuitry maintains signal integrity between the camera body and lens. The 4-element design is made with high quality multi-coated optical glass supplied by Hoya Corporation, the worlds largest manufacturer of optical glass. Full AF operation with the TelePlus MC4 AF 1.4X is possible using camera lenses with open apertures of F4 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the cameras AF sensors properly. (Manual focusing may be necessary when using lenses with smaller open f-stop values than that given above.)
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