This item is brand new and unused. We will offer a discount if you purchase it together with the telephoto lens currently on sale! By attaching this, you can take pictures of things that are further away!! From the internet: Versatile: Made of premium HD optical glass with multi-layer coating, perfect for nature photography, concerts, and bird watching. Enhanced Telephoto Function: The 2x professional teleconverter magnifies your shot to twice its original size, ideal for capturing distant landscapes and wildlife. High-End Optical Design: Special elements eliminate chromatic aberration, improving color consistency for professional-quality images. Compatible Mount: Seamlessly integrates with DSLR cameras and mirror telephoto zoom lenses using a T-mount adapter. Robust Construction: Made from aerospace-grade aluminum alloy, it has a lightweight design that ensures long-lasting performance.