This 50mm-diameter refractor glued green film achromatic lens is a finder scope accessory for astronomical telescopes. Its glued structure integrates optical components, while the green film coating boosts light transmittance and reduces glare. As an achromatic lens, it corrects color fringing to deliver clearer, more accurate celestial imaging. Compatible with most astronomical telescope finder scopes, it functions as a replacement or upgrade part. Constructed from durable optical materials, it maintains stable performance for regular stargazing and astronomical observation use, supporting clearer target locating and viewing.