Experience crystal-clear astronomical views with our 80mm achromatic objective lens, devised for stargazing enthusiasts and astronomy lovers. Features a double separation device and single layer blue film to enhance light transmission and significantly reduce chromatic aberration for superior image . Compatible with focal lengths of 700mm and 800mm, making it an ideal choice for a variety of astronomical applications and experiments. Constructed from two precision lenses and a spacer, ensuring optimal performance and long-lasting durability for serious optical observations. Package includes one objective lens; please note that any visible scratches in images are due to shooting angles and lighting, not defects in the lens itself.