Tokina introduces the SZX 400mm & 2X Extender KIT that allows the photographer to shoot far objects more closer. The kit includes the Tokina SZX SUPER TELE 400mm F8 Reflex MF lens and the 2X Extender TA-020 for T-mount. The Tokina 2X Extender TA-020 is an universal optical tele converter that extends the focal length of the lens 2 times. Thus, the focal length of the SZX SUPER TELE 400mm F8 Reflex MF turns into 800mm. 2X Extender TA-020 adopts T-mount standard and comes between the lens and mount adapter. Recommended for long distance shooting when the 400mm focal length is not enough to reach the desired magnification. technical specifications : Maximum Aperture f/8 Minimum Aperture f/8 Format Full Format (24mm x 36mm) Coating Multi-coated Lens Configuration 5 groups, 6 elements Angle of View 6° 8’ Minimum Focus Distance 1.15m Macro Ratio 1 : 2.5 Filter size (front) 67mm Filter size (rear) 30.5mm Overall length 76.8mm Maximum diameter 74mm Weight (without mount adapter) 355g Hood BH-673 Model 2X EXTENDER TA-020 : Mount standard pitch 0.75mm, thread 42mm Color Black Magnification 2x Exposure correction 2 stops Coating Fully multi coated Weight 115g Dimentions (length x diameter) 41mm x 60mm