The Kenko Teleplus K1.5 AF SHQ DG Teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 1.5x, and will cut back the amount of light by one f/stop. For example, using a 1.5x teleconverter with a 300mm lens will effectively increase the focal length to 450mm. A lens set to f/2.8 will now be f/4.
This converter has has genuine Gate Array IC (Integrated Circuitry). It means the converter's unique circuitry maintains signal integrity between the camera body and lens. The 5-element design is made with multicoated optical glass supplied by Hoya Corporation.
Full AF operation with the Teleplus K1.5 is possible using camera lenses with open apertures of F4.5 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 values than those given above.)