1、2X MAGNIFICATION: The 2X professional teleconverter is a premium teleconverter lens that enhances telephoto capabilities, allowing the focal length or magnification of the shot to be increased to 2x its original size. 2、PROFESSIONAL DESIGN: Specialized lens elements virtually eliminate chromatic aberration, while anti reflective coatings increase light transmission efficiency, improve color consistency, and reduce flare. 3、WIDE APPLICATION: The lens is made of premium HD optical glass material with double sided multi layer coating. Favorable for photographing distant landscapes, wildlife, concerts, observing birds, etc. 4、APPLICABLE MOUNT: Uses a convenient T mount adapter for use between DSLR cameras and lenses such as 420‑800mm 650‑1300mm 500mm 800mm 900mm mirror type telephoto zoom lens. 5、DURABLE MATERIAL: The lens shell is made of aluminum alloy aerospace grade material, CNC closely machined and anodized surface, lightweight and durable. 1 x 2X Teleconverter1 x Lens Storage Pouch Item Type: 2X TeleconverterProduct Material: Aluminum Alloy, Optical GlassApplication: for 420-800mm 650-1300mm 500mm 800mm 900mm T2 Mount Lens Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.