Versatile Focal Lengths: Select from 360mm, 500mm, 600mm, 700mm, 800mm, and 900mm to customize your telescope for the best stargazing experience. Superior Optical Performance: devised with a refractive double separation achromatic lens to minimize chromatic aberration, providing clearer and more detailed images of bodies. Enhanced Light Transmission: Features a single layer blue film optical coating that significantly boosts light transmission for brighter and sharper views during nighttime observations. Perfect for DIY Enthusiasts: Ideal for hobbyists looking to improve their optical systems or build custom telescopes using professional components. Package Details: Includes one D60 objective lens. Please note that images are for reference; any visible scratches are due to shooting angle and lighting, not lens defects.