Kenko Teleplus MC4 1.4X DG

DG MC4 AF 1.4X for Pentax Mount Placed between the camera body and lens, a teleconverter 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 and the MC7 AF 2.0X DG converters have the effect of multiplying the focal length of your lens by 1.4x and 2.0x, respectively, turning a 300mm lens into an equivalent 420mm lens for the 1.4X and 600mm for the 2.0X.

Both the MC4 AF 1.4X and the MC7 2.0X DG converters have genuine Gate Array IC (Integrated Circuitry). This means the converter's unique circuitry maintains signal integrity between the camera body and lens. The 4-element design (for the MC4) and 7-element design (for the MC7) are made with high quality multi-coated optical glass supplied by Hoya Corporation, the world's largest manufacturer of optical glass.

Full AF operation with the TELEPLUS MC4 AF 1.4X and the MC7 AF 2.0X DG is possible using a camera lens with an open aperture of F4 or brighter while the 2.0X DG would require an open aperture of F2.8 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 properly. (Manual focusing may be necessary when using lenses with smaller open f-stop values than those given above.)