Thank you for viewing! This is the C-AF 2X TELEPLUS MC7 2x Teleconverter for Canon EF mount. Simply attaching it doubles the focal length of your existing lens! You can take large photos of distant subjects, making it a great choice for telephoto photography such as sports days, bird watching, sports観戦, and moon photography! Usage Example Example) When attached to a 70-200mm lens → equivalent to 140-400mm When attached to a 300mm lens → equivalent to 600mm Like this! Operation/Condition ・Clear lens (no mold or fogging) ・Beautiful condition with no noticeable scratches ・Secure mounting lock Overall clean with no noticeable scratches or dirt! Accessories ・Front and rear caps ・Lens pouch Recommended points Focal length doubles instantly without buying an additional telephoto lens! Lightweight and easy to carry Enhance telephoto shooting with good cost performance Compatibility (Important) For Canon EF mount lenses Not compatible with EF-S lenses Furthermore, attaching a teleconverter will reduce the brightness of the lens by about 2 stops, and autofocus may not work depending on the lens and camera used. In that case, we recommend using manual focus (MF) m(_ _)m I will sell it to those who need it(^^ゞ