Versatile adjustable focal lengths from 300mm to 900mm, perfect for a wide range of astronomical observations and DIY projects. devised for both amateur and experienced astronomers, enhancing your understanding of telescope functionality and the wonders of astronomy. Durable construction ensures long-lasting performance, making it a reliable choice for all your optical experiments and outdoor adventures. Ideal for educational purposes, allowing users to learn about optics and the universe through engaging hands-on experiences. Package includes one objective lens; please note that images may show scratches due to shooting angle and light, which are not defects of the lens itself.