Used a few times. I'm selling it because I no longer need it after buying a macro lens. Please see the following excerpt from the manufacturer's official description for product details: ********************************************************************************** The "Close-up Lens NC Kit" shortens the minimum focusing distance when attached to a telephoto lens, enabling macro photography. It allows for shooting with zoom lenses/prime lenses with a focal length of 70mm ~ 300mm (full-frame equivalent) at a working distance (※) of 22cm ~ 30cm. (※Working distance: The shortest distance from the lens tip to the subject at which the lens can focus.) Product Overview: Focal length for 1:1 magnification: around 200mm, Diopter: +3.3 The lens employs an APO (apochromatic) design using special low-dispersion glass, which is also used in high-quality telephoto and macro lenses. By correcting chromatic aberration to the extreme, it suppresses color fringing in details and enables sharp, high-resolution macro photography without compromising the lens's descriptive performance.