Scope of Applition----This eyepiece is precisely manufactured for those standard 1.25-inch diameter telescopes, please purchase as needed. replacement for telescope for astronomy replacement for telescope for astronomy High Achromatic----This eyepiece is very suitable for wide and medium star cluster observation. Highly achromatic to enhance the details of Jupiter, Saturn, Venus and planets. Material Quality----This sturdy plastic se protects the eyepiece from dust and moisture. It is a high-quality product. Note----As a seller, we are committed to providing satisfied products and services. If you have any questions, please feel free to contact us. Comfortable to Use----The soft rubber on this eyepiece n protect the eyes, which is especially convenient for people wearing glasses, convenient and practil.